Runners Feet, a Shoe Store, Orders One Hundred Pair of Athletic

Runners Feet, a shoe store, orders one hundred pair of athletic shoes from Speedster Inc. with a shipment contract. Absent a contrary agreement between the parties, title will pass to Runners Feet when

A) the parties sign the contract.
B) the goods exist and are identified.
C) the seller physically delivers the goods to the trucking company for delivery.
D) the buyer physically receives the goods at its place of business and pays for them.