PLEASE HELP ASAP why did the soviet union feel betrayed by the united states at the end of world war II?

A. the soviets were unaware that great britain had also developed nuclear weapons.
B. the soviets were afraid of the satellites spying on them or bombs being dropped from the space.
C. the soviets had not been told about the building of the nuclear weapons in the united states.
D. they were not consulted about the dropping of the atomic bombs in japan.