Read the speech excerpt to answer the question that follows:

"Yesterday, December 7, 1941—a date which will live in infamy—the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan... I regret to tell you that very many American lives have been lost.... I ask that the Congress declare that since the unprovoked and dastardly attack a state of war has existed between the United States and the Japanese Empire."
—President Franklin D. Roosevelt, Address to Congress (1941)

Based on the quote, why did the United States become involved in World War II?

A. The United States felt a duty to enter the war to defend its military allies and trade partners.
B. President Roosevelt was frustrated because Congress ignored previous requests to enter the war.
C. The United States suffered a violent strike that was carried out by a foreign empire without any warning.
D. President Roosevelt convinced Congress that the U.S. should defend a foreign empire from more violence.