Alwin Signed Up Twig as a Talented Bareback Stunt Rider

Alwin signed up Twig as a talented bareback stunt rider. He was thinking his Uncle would hire her for his circus yet he had no direct authorisation to be an agent for his Uncle. Is this contract enforceable by Alwin's Uncle?

A) Yes, if Alvin takes all responsibility for Twig's performance on the contract.
B) Yes, if Twig confirms the contract directly with Alwin's Uncle.
C) No, since this involves an undisclosed principal.
D) Yes, but only if there is ratification within a reasonable time.
E) No, since agent- principal relationships must be established before the contract is formed.