While waiting to open an account at a bank, a poster promises $25 for standing in line five minutes, and the manager tears it down just as the five-minute mark nears. If the customer remains in line for ten more minutes and is served, does the customer have a claim for $25?

• A. Yes, because starting performance creates an option contract that prevents revocation.
• B. No, because the offer never formed a contract.
• C. Yes, but only if the customer completes the five minutes.
• D. No, because the bank can revoke at any time before performance ends.

Answer: (A)