Carter, a 20-year-old American, goes to Japan to study Buddhism. He takes time to conform to Japanese culture and to act appropriately. He changes his individualistic attitude to conform to the collectivistic culture in Japan. Which of the following is most likely exhibited in this scenario? A. psychological reactance.
B. social role.
C. the chameleon effect.
D. the boomerang effect.

which sentences ? that question is incomplete

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."