Why Was the American Fleet Caught by Surprise When Japan

Why was the American fleet caught by surprise when Japan attacked Pearl Harbor?

A) Cryptographers erred in translating the Japanese message and believed that the Japanese planes were on their way to the Philippines.
B) President Roosevelt deliberately did not warn the fleet that an attack was imminent.
C) Faulty radar equipment prevented detection of Japanese aircraft as they approached the naval base.
D) The message warning of the imminence of a Japanese attack was transmitted by a slow method and arrived too late.