Select the most appropriate option that can substitute the highlighted segment in the given sentence.
If you need any help tomorrow, let him knows.

Correct option is A

The correct substitution for the highlighted segment is "let me know."
· The grammatically correct form is "let me know," using the base form of the verb "know" following the object pronoun "me."
· Grammatical rule used: The imperative form "let" is followed by an object pronoun and the base form of the verb.
· Example: If you need assistance, please let me know.