What Was the Chief Bureaucratic Flaw Identified by the National

What was the chief bureaucratic flaw identified by the National Commission on Terrorist Attacks upon the United States?

A) The CIA director lacked adequate access to the president.
B) There was a lack of communication between the domestic and foreign security agencies.
C) The Federal Aviation Administration was not properly monitoring all inbound airplanes on September 11, 2001.
D) Diplomacy with the Taliban and other sponsors of terrorism had broken down in the mid-1990s.
E) The government did not act swiftly enough after the attack in order to prevent further casualties.