According to the u. s. supreme court, in order to have the right to search another person's property, authorities must have
a. the desire to do so.
b. an accusation from another person.
c. reasonable cause.
d. legitimate authority. according to the u. s. supreme court, in order to have the right to search another person's property, authorities must have
a. the desire to do so.
b. an accusation from another

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."