An event or series of events?​

an event is singular.

But we say "a series of events" when there's multiple events taking place (plural)

Explanation:

I think the answer is B. Japan, Germany, and Italy.

Explanation:

This is because Hitler wanted to take over the world but the entirety of Europe will do. Mussolini and Hitler were good friends and Italy backed Hitler by declaring war on Britian when Britain refuses to surrender after the fall of France. Japan was out of natural resources like oil and rubber so they wanted to get get some which was in south east asia. They launched the invasion through Korea, CHina, and so on to get the natural resources in South East Asia.