Ren Offers to Pay Sara to Pick Up and Deliver

Multiple Choice

Ren offers to pay Sara to pick up and deliver certain business documents within thirty minutes. Sara can accept the offer only by completing the task within the deadline. If she does, Ren and Sara will have

A) ​a bilateral contract.
B) ​a unilateral contract.
C) ​a void contract.
D) ​an executive contract.