When is a contract reformation necessary?

After a purchase contract is signed, the seller informs the buyer that the mounted plasma TV that was to be included in the sale (per the contract) is now broken.  The buyer wants to continue the sale, but he would most likely want a:

  1.  discharge
  2.  release
  3.  rescission
  4.  reformation

The answer is d. A reformation would be done to change a contract term – in this case, that the plasma TV would be included.