When Jeff's car breaks down, he asks Insta-Tow, Inc., to tow it to Huey's Repair Shop. There is no discussion of a price, and Jeff and Insta-Tow do not sign any documents. Later, Insta-Tow sends Jeff a bill. With respect to Jeff's obligation to pay the bill, this is
A) an express contract.
B) an implied-in-fact contract.
C) an implied-in-law contract.
D) no contract.