Final answer:
The passage indicating that Americans believed Hawaii was too far away for an attack best supports the idea that the U.S. had not suspected a Japanese attack.
Step-by-step explanation:
The passage from the article that best supports the idea that the U.S. had not suspected an attack by Japan is: D. ...Japan's ambitions of expanding its power in Asia and the Pacific region were well known. However, Americans believed Hawaii was too far away to This passage implies that despite the known ambitions of Japan, the prevailing belief was that the geographic separation between Japan and Hawaii provided a sense of security against a direct attack on the U.S. naval base at Pearl Harbor. This underestimation of Japan's capability and intentions illustrates the lack of suspicion regarding a possible assault on American soil.