According to the text what did the disaster at pearl harbor show that the us military leaders needed?

a a way to prepare military bases defence more quickly
b a way to improve the speed of the telegraph code
c a secure system for recording and playing music
d a secure system for communication with their troops

It could be A or D. Both were reasons that Pearl Harbor got bombed. One, the troops who received the earliest radar of the planes thought they were friendly and did not spread the message. Once they realized they were enemy planes, they went into a panic, did not have defenses and could no longer communicate with other people.

The answer is A), a way to prepare military bases more quickly so they are ready for any possible attack.