During which two decades of the 1900’s was the threat of nuclear war the greatest?

1950s and 1960s.

Explanation:

The 1950s and 1960s were the two decades with the greatest probability of a nuclear war. The first decade was characterized by the development of nuclear warfare by the United States and the Soviet Union such as fission bombs, Hydrogen bombs and fussion bombs, as well as prototypes such as  nuclear-propelled bomber. Lastly, the second decade was marked by the event of Missile Crisis in Cuba, where Soviets installed missiles  on request of Communist regime ruled by Fidel Castro.

d. all of the above is the correct answer here. socialism is the antithesis of capitalism, and uses a command economy and government controlled production.

i am not 100   percent sure but i do know that hitler was burned to death with gas so that makes me think it is d. because they were under his control if they fail or not do as told they will be killed but i could be wrong hope this