On March 1, Mechanic agreed to repair Ohner's machine for $5,000, to be paid on completion of the work. On March 15, before the work was completed, Mechanic sent a letter to Ohner with a copy to Jones, telling Ohner to pay the $5,000 to Jones, who was one of Mechanic's creditors. Mechanic then completed the work. Which of the following, if true, would best serve Ohner as a defense in an action brought against him by Jones for $5,000?
Jones was incapable of performing Mechanic's work. Mechanic had not performed his work in a workmanlike manner. 35 On March 1, Mechanic had promised Ohner that he would not assign the contract.  Jones was not the intended beneficiary of the Ohner-Mechanic contract