The answer is A) Hector Berlioz.
Berlioz wrote Grand Messe des Morts in 1837, a requiem requiring 210 singers, a very large orchestra, and four brass bands.
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”The Yalta Conference, also known as the Crimea Conference and code-named the Argonaut Conference, held February 4–11, 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom, and the Soviet Union to discuss the postwar reorganization of Germany and Europe.”
