A. Axis Powers is your answer.
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During WWII, the main countries in the Axis powers were Nazi Germany, Fascist Italy, and Imperialist Japan, as well as other nations that were under their rules, such as colonies, territories, etc.
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The answer is not:
B) because i do not believe that there was a pact specifically called "German Pact", and so it does not exist.
C) The "Allied Powers" was the term coined for the alliance with Britain and her colonies, Free French and her colonies, America, the U.S.S.R, and other nations.
D) because this term was coined to describe the limits that the U.S.S.R placed on the Eastern half of Europe. It separated Eastern Germany, Hungary, and other nations from the NATO nations. It also excluded Western Berlin (because it was split into 4 parts, with Great Britain, France, and the U.S.A. sharing the western half, and the U.S.S.R taking over the eastern half.
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hope this helps