You Bought a Sanding Machine from the Local Hardware Store

You bought a sanding machine from the local hardware store using the credit card of the store chain on December 30,2015 to be delivered on January 10,2016.When is the sale recognized?

A) When the payment is made to the card
B) When you receive the machine on Jan. 10
C) When you made the purchase on Dec. 30
D) When the credit card company makes the payment to the store