Brock Contractually Agreed to Build a Deck on the Back

Brock contractually agreed to build a deck on the back of Moira's house in exchange for $20 000. It is now two years later and that contract has been brought to court. The judge applied the doctrine of substantial performance. That means that

A) the contract has been discharged for performance.
B) Brock performed all of the conditions, but not all of the warranties, in the contract.
C) Moira must pay $20 000 to Brock.
D) Brock remains obligated to perform the remainder of the contract.
E) neither party is entitled to damages.