The phrase used by the president was specifically chosen to convince the public to support the war is “unprovoked and dastardly attack”. Thus, option "B" is correct.
President Roosevelt was in office when Pearl Harbor happened, and it was the perfect occasion that the government of the United States needed to enter a war that was clearly being won by the Germans and Japanese, they had already taken decisions prior to this to help the allies, but they couldn´t directly send troops when the bombings on Pearl Harbor took place, and since the USA had never provoked, attacked or done anything to upset Japan, they were now able to declare war on Japan an its allies.
Thus, option "B" is correct.
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