The leaders of which three countries were known as the "Big Three" during World War II?

A. Germany, Italy, and Japan

B. United States, United Kingdom, and Soviet Union

C. United Kingdom, France, and Germany

D. United States, Canada, and Mexico

B. United States, United Kingdom, and Soviet Union.

Explanation:

These were the strongest Allied countries fighting against the Axis Powers (Germany, Japan and Italy). F. D. Roosevelt was the president of the USA, Winston Churchill was the British prime minister, and Joseph Stalin was the paramount Soviet leader.