What Motivated Al Qaeda's Attacks on the United States on September

What motivated Al Qaeda's attacks on the United States on September 11,2001?

A) Its desire to initiate an era of democracy and religious tolerance in the Middle East
B) Its wish to rid the Middle East of Western influences
C) Its hope that the attack would force the United States to launch an attack on Iraq
D) Its desire to retaliate for the United States' support of the Soviet Union in the Soviet-Afghan conflict of the 1980s