ANY HELP PLEASE?!

Which factor most contributed to Nazi Germany's decision to invade Poland
in 1939?

A. Germany and the Soviet Union had agreed to divide Poland into
eastern and western halves.

B. Great Britain and France announced that they would abandon their
policy of appeasement.

C. The United States issued economic sanctions against Germany
for its treatment of Jews.

D. Polish corporations discovered vast quantities of oil and natural
gas on their land.