Answer:
I guess its the Battle of Stalingrad
Step-by-step explanation:
A: is incorrect because The battle of midway was after japans attact on pearl hardorm, Germany wasn't involved or the soviets
B: Is correct Germany tried to invaded Russian and the soviet union stopped him(the weather helped a lot) (that's all i remember about it)
C:I don't know
D: The soviet union didn't really help Britian during that time
Soviet union: is made up of 15 European countries