Which reason best explains the U.S. decision to go to war with Irag?

(I point)
A.The president was concerned that Irag would invade other countries in the
region.
B.U.S. surveillance teams thought Osama
bin Laden was hiding in Iraq.
C.The president was determined to shut
down Al Qaeda operations in the region.
D.Some U.S. officials were concerned about
Iraq's possession of WMD.

D.Some U.S. officials were concerned about Iraq's possession of WMD.