Jack, as a disclosed agent for Mike, purchases two tons of wheat on credit from Bryan. According to the agency contract, Jack is entitled to make such purchases under Mike's name. However, Mike refuses to make payment. Which of the following is true?
A) Jack can make part-payment and thereby complete the sale.
B) Bryan can sue Mike for damages.
C) Jack can refuse payment to Bryan on the basis of an un-authorized sale.
D) Mike can sue Jack for wrongful purchase and terminate the contract.