I am looking forward to ___ you.

The correct answer is (b) meeting. Grammar Rule: "Look forward to" is a phrasal verb where "to" is a PREPOSITION (not an infinitive marker). After a preposition, we always use a Gerund (V+ing), not the base form. Formula: look forward to + Gerund (V+ing) → I am looking forward to meeting you. ✓ Similar structures with "to" as a preposition: — be used to + V-ing (I am used to working late.) — be accustomed to + V-ing — object to + V-ing (He objects to being criticized.) — in addition to + V-ing ✗ "meet" — base verb; cannot follow preposition "to" in this structure. ✗ "met" — past tense; grammatically incorrect here. Source: Raymond Murphy – English Grammar in Use; A Practical English Grammar.