On September 1, Roofer and Owner form a contract under which (a) Roofer will repair Owner's roof on or before October 1 and, in exchange, (b) Owner will pay him $1,500. For this question, assume that on September 12, Owner says to Roofer, "I'd like you also to replace my gutters by, let's say, October 3. Will you do that without any increase in price?" Roofer responds, "Certainly. I'll finish the roof repair by October 1, as agreed, and I'll replace the gutters by October 3." After the parties conduct that September 12 conversation, Roofer is obliged to
A.repair the roof by October 1 and replace the gutters by October 3.
B.repair the roof and replace the gutters, all by October 3.
C.repair the roof by October 1 and nothing more.
D.repair the roof by October 3 and nothing more.