An art collector sent a letter to a painter on May 1st, offering to purchase her latest masterpiece for $50,000. The letter stated, 'This offer will remain open until May 10th.' The painter mailed a letter of acceptance on May 5th. On May 6th, before receiving the painter's acceptance, the collector sent a fax revoking the offer. The painter received the revocation on May 7th, and the collector received the acceptance on May 8th. Is there a valid contract?
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A
Yes, because the acceptance was effective when mailed.
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B
No, because the revocation was received before the acceptance was received.
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C
Yes, because the offer was an irrevocable option contract.
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D
No, because the revocation was sent before the acceptance was received.