Fill in the blank with appropriate verb in agreement with its subject.

I am sure, he _____ make you proud

Correct option is A

The completed sentence is: "I am sure, he will make you proud." The word "will" is used here to express certainty and a strong prediction about a future event, which aligns with the speaker's statement of being "sure". The other options (may, can, should) imply possibility, ability, or obligation, respectively, which do not fit the definitive tone of the sentence as well as "will" does .