Where do most of the important voting and election rules
from?
come

The constitution.

Explanation:

The Article I, section 4 of the dictates the way our country should conduct our election.

It granted the congress the ability to create regulations regarding the election. ([This include every small details of the election including the way people could cast off their votes, if there's any voting fee or not, how to count the vote, etc) On top of the election, this part of the constitution also regulate how political parties could appoint their candidates within the primary.

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