What do you know about
sosiology

I think you mean Sociology, but here is a short summary.

Sociology is the study of human behavior and characteristics. There are 7 areas including social organization, sociological, social change, human ecology, population, methods and research, and I think applied sociological. Sociology is important because it helps an individual understand human society and how certain systems work.

That's all I remember, but I hope this helps. Please mark me brainliest.

i honestly have no idea

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."