Rebecca Sees a Pair of Beautiful Silver Shoes in a Store

Rebecca sees a pair of beautiful silver shoes in a store window.She goes in and tells the shopkeeper, "If I am asked to the prom, I will buy those shoes.Please hold them for me." If the shopkeeper signs a note that says, "Will hold for Rebecca silver shoes, style 1028, size 8," will he have to honor that promise?

A) Yes, there is a contract with a condition subsequent.
B) No, there is no contract but simply an illusory promise.
C) Yes, and there is a condition precedent to the contract of sale.
D) No, a contract is formed after Rebecca is asked to the prom.