What might be the most controversial agreement at yalta? a. the establishment of the united nations b. the amount of war reparation payments germany was to pay c. the granting of soviet authority over the nations of eastern europe d. the decision to make the united states, great britain, france, the soviet union and china the five permanent members of the united nations

C. granting the Soviet Union authority over nations in Eastern Europe.

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question