5) Which of the following caused mistrust between the U. S. and Russia during World War II? (USHC-7.3)
A) U. S.A.'s delay in the creating of a second front against Nazi Germany
B) Political and economic differences between communism and democracy.
C) Russia's delay in entering the war against Japan
D) U. S.A. keeping the atomic bomb a secret from Russia
E) All of the above