Why did President Harry S. Truman fire General Douglas MacArthur?

A) MacArthur had openly voiced sympathy with North Koreans.
B) MacArthur stated he would run as the Republican presidential candidate.
C) MacArthur had accused Truman of incompetence and political posturing.
D) MacArthur was found to have had an extramarital affair with his secretary.

Douglas MacArthur

An American five-star general and Field Marshal of the Philippine Army who was Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II.

Harry S. Truman

The 33rd president of the United States (1945–1953) known for his leadership during the final stages of World War II and the early years of the Cold War.

Voiced Sympathy

Expressing feelings of pity and sorrow for someone else's misfortune.