Correct Answer:
C. Poland
The correct answer is (C) Poland. World War II officially began on September 1, 1939, when Nazi Germany invaded Poland. This aggressive act prompted Great Britain and France to declare war on Germany, marking the start of the global conflict.
- (A) Russia (Soviet Union) was invaded by Germany in June 1941, much later in the war.
- (B) Spain remained neutral during World War II, having just concluded its own civil war.
- (D) UK was never successfully invaded by Germany, although it faced intense aerial bombardment during the Battle of Britain.