What did the refusal of the united states to join the league of nations indicate?
a. the rise of isolationism in the congress
b. desire to change the treaty of versailles
c. the anti-immigrant feelings that increased after the war
d. opposition to great britain having control over the league

A. The rise of isolationism in the congress. 

After WW1 people were petrified to become involved in anything. Even before WW1 they were. Congress as well as the nation became pro isolationism (the refusal to be involved in other nations business). They rejected it because they worried that they would end up in another war.

The answer to your question would be b