Question

5. Which incident precipitated the outbreak of World War II?
a. Germany's attack on Poland b. Germany's attack on France
c. Germany's attack on USSR​

Answer 1

The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939 and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes.

Answer 2

a. Germany's attack on Poland