Answer:
D. the buyer must pay the expense.
Step-by-step explanation:
Whenever a contract is prepared for a sale of any real estate transaction then both the parties are binding towards the contract. As that is signed by both of them which creates a legal right to get the action done from each other.
Here ,in the contract it is clearly mentioned that the buyer is responsible for the title insurance expense.
This clearly provides the right to the seller to validate such right and ask the buyer to pay for the expenses of the insurance.
Thus, the buyer in the given instance must pay the expense of the insurance.