Lauren files a suit against Moving Service for breach of contract, based on what Lauren claims was Moving's offer. For a court to determine if a contract has been breached, under the common law, the offer must include terms that are:
a) exactly precise
b) reasonably definite.
c) unequivocally approximate.
d) vague or uncertain.

REASONABLY DEFINITE.

Explanation: Reasonably definite standard means a clearly measurable standard under which a holder of a power of distribution is legally accountable within the meaning of the terms stated.

A contract must have reasonably definite terms so that a court can determine if a breach has occurred and can give an appropriate remedy.  

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; reincarnation of an eternal soul;