B. i think... yea it should be.
The Transcontinental Railroad was also instrumental in putting thousands of people to work, and also they were instrumental in transporting cattle and resources in much more efficient ways.
B. The U.S. declared war on Japan after the attack on Pearl Harbor. While it was an important naval base, and that was the reason that the Japanese attacked it, in the grand scheme of things it didn't matter all that much, considering the U.S. at the time was focusing its naval efforts on the Atlantic rather than the Pacific, though it did have one eye open. However, when the Japanese attacked Pearl Harbor, that's when the Pacific got hot and war was declared.
tl;dr the answer is B
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