Correct option is A
Option (a) contains an error.
Explanation: The correct phrase should be “to meeting you.”
The phrase “look forward to” is always followed by a
gerund (verb + ing) and not an infinitive or a verb in any other form.
“To” here is a
preposition, not part of an infinitive, hence it should be “meeting” and not “meets.”
Grammatical rule used:
When certain verbs or phrases end in a preposition (like “look forward to”, “be used to”, “admit to”), the verb following the preposition must be in the gerund (-ing) form.
Example:
❌ I am looking forward to see you.
✅ I am looking forward to seeing you.