Fill in the blank with the appropriate Modal.

He is afraid to speak, lest he ________ be laughed at.

(A) ought
(B) might
(C) can
(D) should

Choose the correct answer from the options given below:

(D) Only

The correct answer is Option (1) - (D) Only

The word "lest" introduces a clause that explains the fear or concern about a negative possibility. In standard usage, "lest" is typically followed by the modal "should" to express this potential outcome. Hence, option (D) "should" is the most appropriate choice.