CupCo manufactured disposable cups and sold them to distributors. SupCo was a distributor of disposable cups, and on all the cups it sold, stamped its own name and imprint. On August 1, in its own truck, CupCo sent SupCo two thousand disposable coffee cups, in boxes, together with this message: We provide herewith two thousand of our new CoffeeFriend coffee cups. We assume you'll want to sell them to your own customers. If you keep them, we'll assume that you've decided to buy, and we'll bill you $125. If you do not wish to buy, please return to us within fifteen days, COD; we will pay the shipping charges. Which of the following would most likely mean that SupCo accepts CupCo's offer?
A.SupCo keeps the cups in their unopened boxes for more than fifteen days.
B.SupCo writes to CupCo: "We will keep the cups until you come to get them."
C.SupCo writes to CupCo: "We very much like the cups."
D.SupCo stamps its own name and imprint on the cups.