Instructions: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Input: Question: When did the Tsar who Mannerheim had a prominent place in the ceremonies for first come to power? Passage:Mannerheim made a career in the Imperial Russian Army, rising to the rank of lieutenant general. He also had a prominent place in the ceremonies for Tsar Nicholas II's coronation and later had several private meetings with the Tsar. After the Bolshevik revolution, Finland declared its independence but was soon embroiled in civil war between the pro-Bolshevik "Reds" and the "Whites", who were the troops of the Senate of Finland, supported by troops of the German Empire. Mannerheim was appointed the military chief of the Whites. Twenty years later, when Finland was twice at war with the Soviet Union from November 1939 until September 1944, Mannerheim successfully led the defence of Finland as commander-in-chief of the country's armed forces. In 1944, when the prospect of Germany's defeat in World War II became clear, Mannerheim was elected President of Finland and oversaw peace negotiations with the Soviet Union and the UK. He resigned the presidency in 1946 and died in 1951.
Links: a. Nicholas II of Russia b. World War II c. World War II d. Finnish Civil War
Output:
a