Vi Offers to Pay Allison $150 If Allison Will Paint

Multiple Choice

Vi offers to pay Allison $150 if Allison will paint her apartment while she is out of town on vacation for two weeks.Allison makes no promise but tells Vi that she will think about it.While Vi is out of town, Allison paints the apartment.This is best described as:

A) a unilateral contract.
B) a quasi contract.
C) an implied in fact contract.
D) a bilateral contract.