Immediately following world war i, the economy in the united states

a. suffered.
b. prospered.
c. was unaffected.
d. plunged to its lowest numbers.

Correct
Option B. Prospered 

During the war USA made large amounts of loan payments to UK to help them with the war. The companies of USA stretched out to other countries. In order to provide large amounts of weapons and war goods during the war, new manufacturing jobs were created. A large number of men were asked to join the military. As a result of these efforts, the unemployment rate fell in USA from 7.9% to 1.4% and the economy of USA was roaring. The economy of USA boomed for about a decade after which it started to fall. 

Therefore, the answer to this question is propered as immediately following WW1 the economy of USA was prospering.