3. What was the difference between the German troops and the U. S. troops? a. German troops were fatigued and the U. S. troops were fatigued.
b. German troops were fatigued and the U. S. troops were fresh.
c. German troops were fresh and the U. S. troops were fatigued.

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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."

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