How is payment calculated for a party who renders substantial, but not complete, performance under a contract?

A. The party receives what a reasonable person, acting in good faith, would pay for the performance.

B. The party receives the market value of the performance.

C. The party receives the full contract price because the other party received the benefit of the bargain.

D. The party is paid the contract price, minus the costs to the other party of having the work completed.

PLEASE HELP ME FIND AN ANSWER FOR THIS QUESTION WITH REASONING