You will be given a definition of a task first, then some input of the task.
In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: The Treaty of Brest-Litovsk was a peace treaty signed on 3 March 1918 between the new Bolshevik government of Soviet Russia and the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I. The treaty was signed at Brest-Litovsk (since 1945 Brest), after two months of negotiations. The treaty was forced on the Bolshevik government by the threat of further advances by German and Austrian forces. According to the treaty, Soviet Russia defaulted on all of Imperial Russia's commitments to the Triple Entente alliance., The 1918 Spring Offensive or Kaiserschlacht ("Kaiser's Battle"), also known as the Ludendorff Offensive, was a series of German attacks along the Western Front during the First World War, beginning on 21 March 1918, which marked the deepest advances by either side since 1914. The Germans had realised that their only remaining chance of victory was to defeat the Allies before the overwhelming human and matériel resources of the United States could be fully deployed. They also had the temporary advantage in numbers afforded by the nearly 50 divisions freed by the Russian surrender (the Treaty of Brest-Litovsk)., Brigadier - General Edgar William Cox , DSO , FRGS ( 9 May 1882 -- 26 August 1918 ) was a senior intelligence officer on the British General Staff throughout most of the First World War who drowned in suspicious circumstances whilst swimming in August 1918 shortly after the German successes in the Spring Offensive which drove the Allied armies back a large distance . Although officially an accident , suspicions of suicide surrounded his death , which occurred just days before the beginning of the Allied counterattack which would eventually defeat the German army ., Subject: edgar william cox, Relation: conflict, Options: (A) spring offensive (B) world war (C) world war i
Output:
world war i