❗️❗️which was not a cause of wwii in europe? a. failure of the treaty of versailles b. german invasion of poland c. fall of france d. failure of appeasement !

I'm 100% sure, the answer is B. German invasion of Poland. 
The Germans invaded Poland, and crossed Poland to Russia, where they broke the treaty with the Soviet Union.
Afterwards, the Soviet Union joined the Allies, and WWII began.
Hope this helps!:)

Answer is c, fall of France