Why Did the United States' Foreign Policy After the Terrorist

Why did the United States' foreign policy after the terrorist attacks of September 11,2001,negatively affect the United Nations?

A) When the Security Council did not approve an invasion of Iraq,the United States ignored the United Nations and went to war anyway.
B) The United Nations opposed the war on Afghanistan,but the United States invaded the country anyway.
C) The United Nations did not approve of the invasion of Iraq but was discredited when it was learned that Iraq had sponsored acts of terrorism against the United States.
D) U.S.troops found Iraqi weapons of mass destruction that United Nations inspectors had not been able to find.