Please answer the following question: Information:  - Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries.  - The Gulf Stream, together with its northern extension towards Europe, the North Atlantic Drift, is a powerful, warm, and swift Atlantic ocean current that originates in the Gulf of Mexico and stretches to the tip of Florida, and follows the eastern coastlines of the United States and Newfoundland before crossing the Atlantic Ocean. The process of western intensification causes the Gulf Stream to be a northward accelerating current off the east coast of North America. At about , it splits in two, with the northern stream, the North Atlantic Drift, crossing to Northern Europe and the southern stream, the Canary Current, recirculating off West Africa.  - Gunnar Gunnarsson (18 May 1889  21 November 1975) was an Icelandic author who wrote mainly in Danish. He grew up, in considerable poverty, on Valþjófsstaður in Fljótsdalur valley and on Ljótsstaðir in Vopnafjörður. Despite great difficulties, he became one of the most popular novelists in Denmark and Germany.  - The Republic of Iceland, "Lýðveldið Ísland" in Icelandic, is a Nordic island country in the North Atlantic Ocean. It has a population of and an area of , making it the most sparsely populated country in Europe. The capital and largest city is Reykjavík. Reykjavík and the surrounding areas in the southwest of the country are home to over two-thirds of the population. Iceland is volcanically and geologically active. The interior consists of a plateau characterised by sand and lava fields, mountains and glaciers, while many glacial rivers flow to the sea through the lowlands. Iceland is warmed by the Gulf Stream and has a temperate climate, despite a high latitude just outside the Arctic Circle. Its high latitude and marine influence still keeps summers chilly, with most of the archipelago having a tundra climate.  - A lava field, also called a lava plain or lava bed, is a large expanse of nearly flat-lying lava flows. Such features are generally composed of highly fluid basalt lava, and can extend for tens or even hundreds of miles across the underlying terrain. The extent of large lava fields is most readily grasped from the air or in satellite photos, where their typically dark, nearly black color contrasts sharply with the rest of the landscape. According to the US Geological Survey, monogenetic volcanic fields are collections of cinder cones, and/or Maar vents and associated lava flows and pyroclastic deposits. Sometimes a stratovolcano is at the center of the field, as at the San Francisco Volcanic Field in Arizona. Monogenetic volcano fields have systematic growth patterns that suggest they represent single magmatic systems in the same way that stratovolcanoes do, but monogenetic volcanoes grow laterally rather than vertically (Wood and Shoan, 1984). Detailed mapping indicates that some cinder cones in monogenetic fields (e.g., Cima, California, and Timber Mountain Volcanic Field, Nevada) may have had multiple eruptions separated by tens to hundreds of thousands of years (Wells, et al., 1989). Thus, some monogenetic cones may actually be polygenetic. This possibility differs from observations of historic eruptions (Wood, 1979), and is physically difficult to understand because cinder cone conduits are narrow and must solidify within a few years of eruption. Nonetheless, such multiple eruptions appear to have happened at least twice: Other cinder cones need to be closely reexamined.  - Fljótsdalur is a valley in east Iceland, formed by the Lagarfljót River. Lake Lagarfljót and the city of Egilsstaðir are located in the valley.  - Vopnafjörður is a village and municipality in Northeast Iceland, standing on a peninsula in the middle of a mountainous bay by the same name. The main industries of Vopnafjörður are fish processing, agriculture and tourism and other services.  - Sons of the Soil ( Danish : Borgslægtens historie , Icelandic : Saga Borgarættarinnar ) is a Danish film directed and shot by Gunnar Sommerfeldt in Iceland in 1919 , based on the novel by Gunnar Gunnarsson . It was released in 1921 .  - Reykjavík  is the capital and largest city of Iceland. It has a latitude of 64°08' N, making it the world's northernmost capital of a sovereign state, and is a popular tourist destination. It is located in southwestern Iceland, on the southern shore of Faxa Bay. With a population of around 130,000 (and over 200,000 in the Capital Region), it is the heart of Iceland's cultural, economic and governmental activity.    After reading the paragraphs above, we are interested in knowing the entity with which 'sons of the soil' exhibits the relationship of 'country of origin'. Find the answer from the choices below.  Choices: - africa  - california  - denmark  - europe  - iceland  - mediterranean sea
A:
denmark