A policy under which a specific number of jobs, promotions, or other types of placements, such as university admissions, are given to members of selected groups is known as a .

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."

answer; the miracles;

answer; a client who is similar to you;

answer/// constitutional amendment;