What was the experience of the Soviet Union during WWI compared to the United States?

A. The USSR suffered greater losses of life and financial costs.
B. The USSR contributed fewer resources and sent fewer soldiers to fight the Germans.
C. The USSR was more hesitant to condemn the Nazis and the policies.
D. The USSR was late in joining the war.

NO NEED FOR EXPLANATIONS. PLEASE MENTION IF IT'S EITHER A, B, C or D! Thank you!