General Macarthur addressed Congress because he wanted to justify his recommendations for expanding the Korean War.
Answer: Option C
Step-by-step explanation:
President Harry Truman believed that for the setback received in North Korea by the Chinese army, none other than General Macarthur was responsible. He fired General Macarthur for not complying with his suggestions and instead insisting on bombing China and using the army of Taiwan for further operations.
After Macarthur returned to the United States in April 1951, he delivered a speech before the United States Congress through which he tried to criticise the policy of President Truman on North Korea. He also tried to legitimise his stand on expanding the war.