Vicky Asks Walt, a Cobbler, to Repair a Pair of Boots

Multiple Choice

Vicky asks Walt, a cobbler, to repair a pair of boots. There is no discussion of a price, and Vicky and Walt do not sign any documents. After the repair, Walt hands Vicky a bill. With respect to Vicky's obligation to pay the bill, this is

A) an express contract.
B) an implied contract.
C) a quasi contract.
D) no contract.