The enlightenment idea of "natural rights" is that
a. monarchs rule by divine right
b. people have natural rights that governments cannot arbitrarily take away
c. ethical principles are capable of being discovered through reason
d. governments and people cannot exist without each other

D.governments and people cannot exist without each other

the answer is d. amendments.

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."