Dr. smiths is designing a study to investigate whether aggressive preschoolers are likely to become aggressive adolescents a. cross sectional design
b. laboratory method
c. ethnographic method
d. longitudinal design

imagine me knowing the answer

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; having the power of reprieve means being able to release people from punishment;

answer; silence;