Shoddy Roofing Company Agrees to Do the Roofing on a Building

Shoddy Roofing Company agrees to do the roofing on a building owned by Tacky Construction Company for $50,000.One week after Shoddy finishes work,over 20% of the shingles fall off due to improper installation.Tacky promises Shoddy an additional $10,000 to reinstall the fallen shingles,and Shoddy does so.Then Tacky refuses to pay Shoddy more than $50,000 for the work.Identify the true statement with regard to this situation.

A) Shoddy is not entitled to any more than $50,000 for its work.
B) Tacky owes Shoddy the additional $10,000.
C) Shoddy would still be entitled only to $50,000 if the shingles had fallen off due to an unforeseeable earthquake hitting the building.
D) Shoddy would still be entitled only to $50,000 if the parties had voluntarily cancelled their original contract and entered a new one for $60,000.