The United States Was Unprepared for the Attack at Pearl

The United States was unprepared for the attack at Pearl Harbor because

A) coded messages intercepted by U.S. agents indicated that an attack on Southeast Asia was planned.
B) American military leaders were overconfident and believed that no nation would dare attack.
C) Franklin Roosevelt deliberately exposed the fleet to destruction in order to bring the United States into the war.
D) the United States and Japan were on friendly terms.
E) Germany had assured the U.S. that Japan would not attack.