Wilma Offers Her Car, a 1989 Volkswagen Polo, for Sale

Wilma offers her car, a 1989 Volkswagen Polo, for sale at £750. Vijay sees the advertisement and calls Wilma to ask whether he can come see the car the following Saturday. Wilma proposes to meet on Sunday as she is unavailable on Saturday. Vijay cannot meet on Sunday and decides to send his cousin Sanjay to inspect the car. After Sanjay reports back to Vijay, Vijay calls Wilma to say he's interested but thinks the price is too high. He offers £675 for the car and says his offer is valid until Thursday. On Wednesday, Sanjay sees Wilma on the High Street and tells her that Vijay's no longer interested in the car. Wilma immediately calls Vijay to accept his offer of £675. Has Wilma concluded a contract with Vijay?

A) Yes, for £675. Vijay promised to give Wilma until Thursday to accept his offer and she did so before then
B) Yes, for £675. Only the offeror can revoke an offer, not a third party. Wilma could accept until Thursday.
C) Yes, Vijay is not yet aware that his revocation has had effect. Until Sanjay communicates this, the offer is still valid.
D) No, Vijay's offer was revoked when Sanjay communicated this to Wilma.