A form of government in which a dictatorial leader has absolute power is best described as which of the following
A: representative democracy
B: oligarchy
C: autocracy
D: socialism

is this an essay or multiple choice

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; generalizability;