Given the task definition and input, reply with output. 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: Leopold Hermann Ludwig von Boyen ( 20 June 1771 -- 15 February 1848 ) was a Prussian army officer who helped to reform the Prussian Army in the early 19th century . He also served as minister of war of Prussia in the period 1810 - 1813 and later again from 1 March 1841 -- 6 October 1847 ., An army (from Latin "arma" "arms, weapons" via Old French "armée", "armed" (feminine)) or ground force is a fighting force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or state. It may also include other branches of the military such as the air force via means of aviation corps. Within a national military force, the word army may also mean a field army. They differ from army reserves who are activated only during such times as war or natural disasters., The Kingdom of Prussia was a German kingdom that constituted the state of Prussia between 1701 and 1918 and included parts of present-day Germany, Poland, Russia, Lithuania, Denmark, Belgium and the Czech Republic. It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg, where its capital was Berlin., The Royal Prussian Army served as the army of the Kingdom of Prussia. It became vital to the development of Brandenburg-Prussia as a European power., Subject: hermann von boyen, Relation: languages_spoken_or_written, Options: (A) french (B) german (C) latin
german