For the purposes of this question only, assume Alex began performance on May 4, and that Owner knew of this. If Owner's offer to Alex is considered an ambiguous offer, which of the following is true?
(A) Alex may cease fixing the roof without breach, but Owner must hold his offer open for a reasonable period of time.
(B) Owner can revoke his offer without breach, but Alex may not cease fixing the roof without breach.
(C) Owner would breach the contract if he refused to go forward and revoked the offer, and Alex would breach the contract if she ceased fixing the roof.
(D) They have no enforceable contract.