Final answer:
Option B is not true. President Roosevelt knew what to do after the U.S. was attacked.
Step-by-step explanation:
According to the given options, all of them except option B are true. Option B states that President Roosevelt wasn't sure what to do after the U.S. was attacked, which is not accurate. In reality, after the attack on Pearl Harbor, President Roosevelt asked Congress for a declaration of war against Japan, uniting the country behind a war effort.
Learn more about The accuracy of statements regarding the attack on Pearl Harbor