To amend a contract of purchase or sale, the realtor must ...

• A. Ensure the amendment terminates the existing contract
• B. The amendment becomes binding immediately
• C. The amendment requires no signatures to be binding
• D. Ensure the amendment is not legally binding until all parties to the original contract resign for the amendment to take effect

Answer: (D)

The key idea is that changes to a contract must be agreed to by everyone involved and put in writing with signatures. An amendment isn’t binding just because one party agrees; it only becomes enforceable when all parties to the original contract have signed the amendment and dated it. If someone doesn’t sign, the original terms stay in effect.

That’s why the correct choice states that the amendment isn’t legally binding until all parties to the original contract sign for it to take effect. The other options miss this fundamental point: an amendment doesn’t terminate the contract by itself, it isn’t binding without signatures, and it does require signatures to be valid.