Final answer:
The correct answer is C, with the speech to the public emphasizing the treachery of Japan's attack on Pearl Harbor.
Step-by-step explanation:
The question asks for an analysis of the major difference in emphasis between two of President Franklin D. Roosevelt’s speeches given after the attack on Pearl Harbor. Between the choices provided, the correct answer is C, which highlights that the speech to the American public emphasizes Japan's treachery. In the “Pearl Harbor Address to the Nation”, Roosevelt focuses on the deceit and planned nature of the attack. In contrast, the “Fireside Chat 19: On the War with Japan”, he speaks more emotionally about the betrayal and its effects, including the loss of American lives and destruction of military assets.