Question

Which of the following details is not one of the pieces of evidence FDR produced to support his claim that the Japanese attacks on Pearl Harbor were unprovoked?
a. The U.S. was in talks with Japan at the time of the attacks.
c. Japan attacked a number of places at the same time, establishing itself as an aggressor.
b. The Japanese ambassador to the U.S. spoke to FDR and explained that the attacks were intended to serve as a warning to other countries.
d. The distance of Hawaii from Japan made it obvious that the attack had been planned in advance.

Answer 1

The answer is B.  The Japanese ambassador to the U.S. spoke to FDR and explained that the attacks were intended to serve as a warning to other countries. 
It's true that after the attack the Japanese Government sent a message to FDR. But according to him, non of the message had any hint of threat or war. This anger FDR due to other factors supported that Japan's attack was unprovoked which lead to American involvement in the world war II