The 9/11 Comission concluded that

Its primary conclusion was that the failures of the U.S. Central Intelligence Agency (CIA) and Federal Bureau of Investigation (FBI) permitted the terrorist attacks to occur and that if these agencies acted more wisely and more aggressively, the attacks could potentially have been prevented.

Explanation:

Hope this helps! -C.E.T.

its b wells tried to fight lynching in the south by

the answers are a b and d