Why might the loss of the polish corridor and danzig have been especially difficult for germans

Because Germany would be close off and isolated from the rest of the world, it would be hard to get there and there would be lack of transportation.

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

your answer will be b. improving roads, bridges, and other infrastructure. hope i !