Which clause requires written consent from the lender before the borrower can transfer or sell the collateralized property?

The correct choice is the due-on-sale clause. This clause allows the lender to require full repayment of the loan if the borrower transfers or sells the property that serves as collateral for the loan. Essentially, the clause protects the lender's interest by ensuring that they can assess the creditworthiness of any new owner of the property.

When the borrower sells or transfers the property without seeking the lender's consent, the lender may invoke the due-on-sale clause to call the loan due. This ensures that if the property changes hands, the lender can either approve the new buyer or require repayment to maintain control over the loan and its associated risks.

In contrast, an alienation clause also deals with transfer of property but may not always result in the loan being called due; it often gives the lender the right to approve the sale. The assumption clause refers to a situation where a buyer takes over the existing mortgage under the same terms, but it does not specifically require the lender's consent for the transfer. A subordination clause relates to the hierarchy of claims in the event of default and does not pertain to transfer of ownership.