3. Carter wants to impress his boss, Marco. Carter approaches one of Marco's potential clients and negotiates a contract with the client on Marco's behalf. The client agrees and signs the contract. Marco, however, doesn't know about Carter's negotiation. Carter lacks the authority to negotiate on Marco's behalf. When Marco finds out, he is so pleased about the contract that he overlooks Carter's actions and tells Carter he did an excellent job landing the client. This forms an agency by

A. operation of law.

B. ratification. C. estoppel. D. agreement.