Activity In the tutorial, you learned about some prominent sociological thinkers. Which of these sociologists impressed you the most? What did you like
about this sociologist's work, methodology, and perspective? Does the work of this social thinker inspire you to pursue a career in sociology?

the answer would be in this answer. someone already asked the question.  

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; control group;