D is corrent because both partially disclosed and fully disclosed principals can ratify an unauthorized contact. A is incorrect. A fully disclosed and partially disclosed principal generally can ratify an unauthorized contract made by its agent. Normally undisclosed principals can not. B is incorrect because although fully disclosed and partially disclosed principals may normally ratify the unauthorized contract, the undisclosed principal normally may not. C is incorrect because, in general, an undisclosed principal may not ratify unauthorized contracts.
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