Questions: The clause in a trust deed or mortgage that permits the lender to declare the entire unpaid balance immediately due and payable upon default is the Select one: a. acceleration clause. b. escalator clause. c. judgment clause. d. forfeiture clause.

The answer is A: acceleration clause.

Explanation for each option:

a. Acceleration clause: This is the correct answer. An acceleration clause in a trust deed or mortgage allows the lender to demand the entire unpaid loan balance immediately if the borrower defaults on the loan. This clause is designed to protect the lender by providing a mechanism to recover the loan amount quickly in case of default.

b. Escalator clause: This clause is typically found in leases or contracts and allows for an increase in payments or costs under certain conditions, such as inflation or increased operating costs. It is not related to declaring the entire loan balance due upon default.

c. Judgment clause: This clause allows a lender to obtain a judgment against a borrower without a trial if the borrower defaults. It is not specifically about declaring the entire loan balance due immediately.

d. Forfeiture clause: This clause is often found in contracts and leases, allowing one party to terminate the agreement and retain any payments made if the other party defaults. It does not specifically address the immediate payment of the entire loan balance upon default.

Therefore, the correct answer is the acceleration clause, which permits the lender to declare the entire unpaid balance immediately due and payable upon default.