Read this passage from Franklin Delano Roosevelt's address to the nation after the attack on Pearl Harbor. Indeed, one hour after Japanese air squadrons had commenced bombing in the American island of Oahu, the Japanese ambassador to the United States and his
colleague delivered to our Secretary of State a formal reply to a recent American message. And while this reply stated that it seemed useless to continue the existing diplomatic negotiations, it contained no threat or hint of war or of armed attack.

Which statement is the best example of an implicit idea from this passage?

A. Japan's negotiations with the United States were deceitful and dishonest.

B. Both Japan and the United States were trying to reach a peaceful resolution

C. Japan delivered a formal reply to an American message after the
country had begun the attack on Pearl Harbor.

D. Japan had previously warned the United States that the country
would attack if its demands were not met