Which idea resulted in austria-hungary being divided into independent states organized around shared culture and language following world war 1
a. mandate system
b. communism
c. imperialism
d. self-determination

D. Self-determination

Explanation:

The most important idea that led to the division of Austria into the Hungarian Empire after the First World War is self-determination. This idea, for several other reasons, also led to the beginning of the WWI.

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