In 2004,Congress Created a Director of National Intelligence

In 2004,Congress created a director of national intelligence.Why did Congress do this?

A) to help the director of the Central Intelligence Agency combat the growing threat posed by weapons of mass destruction
B) to better coordinate the large number of people working in diverse intelligence agencies
C) to decentralize authority within the intelligence community to prevent competition between agencies
D) because the previous organizational structure of the intelligence community encouraged the various agencies to do too much of their work collaboratively,which led to groupthink