Kip Sells an Apartment Building to Lacy with a Promise

Multiple Choice

Kip sells an apartment building to Lacy with a promise to repair the roof, which violates the local housing code, within six months. One year later, Kip sends Milo, a carpenter, to fix the roof. Lacy orders Milo to leave and refuses to make further payments to Kip, who files a suit against Lacy.
-Refer to Fact Pattern 15-2.With respect to Mutual's duties,Neil's performance most likely

A) discharges Mutual from the contract.
B) has no effect on Mutual's performance.
C) increases Mutual's duties under the contract.
D) suspends Mutual's duty to perform.