The united states sent troops to korea in an attempt to a) wipe out communism b)test nuclear weapons c)support their chinese allies d)contain communism

D, contain communism is the correct answer.

The United States sent troops to Korea in an attempt to contain communism.

They wanted to prevent North Korea from taking the whole peninsula and making it communism. That's why the Korean War surged, which costed the lives of many innocent people. 

Have a nice day! :)