Aside from Reasons of Self Defense, What Was the Other

Aside from reasons of self defense, what was the other rationale that the United States and Great Britain used to support their case for the invasion of Iraq in 2003?

A) The existence of weapons of mass destruction threatened the world.
B) That Saddam Hussein was a bloody tyrant who had killed thousands of his own people.
C) That the leader of Iraq had ignored earlier Security Council resolutions.
D) That they needed to gain access to important security clearances.