Answer: B. Americans need to be reassured that they will triumph,
Step-by-step explanation:
On the 7th of December 1941, the Japanese attacked the U.S. base at Pearl Harbor, Hawaii and in effect declared war on the United States. The next day, Roosevelt gave a speech before Congress asking them to declare war. This question is based on that speech.
In the speech, Roosevelt acknowledged that the U.S. was in danger and sought to reassure the American people that they would win the war. He urged them to have faith in the military forces of the nation and to have the determination to win as he believed this to be the key to the U.S. wining the war.