What was the main strength of the feudal system in medieval europe?

a
it allowed art, learning, and architecture to flourish.
b
it offered protection from threats like the black death.
c
it allowed many levels of society to give benefits to one another.
d
it created a system in which both catholics and protestants could do well.
.

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

number 4. should be the correct answer