One reason the United States entered World War I was because of A. the sinking of the Lusitania. B. an invasion by the British. C. an attack on Pearl Harbor. D. bombings of New York City.

A) the sinking of the Lusitania

Explanation: The other three options can be eliminated pretty easily:

B) is not correct because the British never invaded the United States, especially not during WWI, as we were on their side

C) is not correct because the bombing of Pearl Harbor occurred during WWII

D) is not correct because NYC was never bombed

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