What is one reason that people want to minimize costs ? a. costs are often bad things that people don’t want to accept. b. costs always involve spending money. c. costs always have to be paid before a benefit arrives. d. costs are calculated differently by everyone .

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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