Bill Recently Borrowed $50 from Ricardo for a Couple of Weeks.Bill,still

Multiple Choice

Bill recently borrowed $50 from Ricardo for a couple of weeks.Bill,still short of cash,tells Ricardo,"I will wash and wax your car in exchange for the $50 I owe you." Ricardo tells Bill,"OK,that's great!" Ricardo's performance of his new duty will be a(n) :

A) accord.
B) novation.
C) rescission.
D) satisfaction.