North Carolina contributed troops the the confederate Army. A. 125,000
B. 15,000
C. 30,000
D. 50,000

A. If my answer is wrong, please correct me :).

Explanation:

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."