Answer:
C. Because it was believed that Iraq had weapons of mass destruction is the correct answer.
Explanation:
United States invaded Iraq on 20th March 2003, combined forces of UK, Australia and Poland participated in the invasion and it lasted for one month. Iraq was alleges of having developed the weapons of Mass destruction, another justification was that Saddam Hussein had link with terrorist organisations such as Al-Qaeda. The US government tried to show Iraq war as the war on terrorist organisations. Although both of these argument were discredited by US intelligence agencies soon after the invasion of Iraq.