What effect did the great white fleet have on japan?
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a. the japanese felt their navy was superior.
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b. it had no impact on the japanese.
c. the japanese were impressed.
d. the japanese were angry about foreign ships in their harbor.

haile selassie i was the emperor of ethiopia from 1930-1974

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."