Which of the following, if true, would best serve Ohner as a defense in an action brought against him by Jones for $5,000?
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
Jones was incapable of performing Mechanic's work.