What Was the Main Reason for the Rash of Strikes

What was the main reason for the rash of strikes that began in late 1945 and extended through 1946?

A) Major unions were competing with one another to get the best deal for their members.
B) The Communist Party had actively recruited workers during the war and was now ready to assert itself.
C) Most major corporations had withdrawn vacation and pension benefits that had been extended during the war years.
D) With the end of price controls, workers were hit hard by skyrocketing inflation.