Why Did Combat at Kasserine Pass Run Counter to Later

Why did combat at Kasserine Pass run counter to later engagements in Northern Africa?

A) Inexperienced American troops were quickly defeated by the Germans.
B) British officers refused to listen to their American counterparts.
C) British troops quickly disheartened the less experienced German cavalry.
D) The hierarchy of the U.S. military survived and went basically unchanged throughout the ordeal.