Final answer:
The buyer must abide by the terms of the land sales contract.
Step-by-step explanation:
The correct statement in this situation is B) The buyer must abide by the terms of the land sales contract. When the buyer signed the land sales contract, they agreed to the terms and conditions outlined in the contract, including the prohibition of prepayment. While it may be frustrating for the buyer that the vendor refused to accept the payoff, the buyer is legally bound by the terms of the contract.