A) The United States was unprepared, and most of the U.S. fleet was destroyed.
On Sunday morning, December 7, 1941, the strike on Pearl Harbor happened which was a bewilderment militant violence by the Japanese Navy Air Service on the marine base at Pearl Harbor in Hawaii against the United States. Japan planned the attack as a defensive effort to prevent the United States Pacific Fleet from intervening with its prospective aggressive efforts in Southeast Asia against across the areas of the Netherlands, United Kingdom, and the United States.