“Look forward to”

Answers B and C are correct.

In the phrase “look forward to”, the “to” is not an infinitive; it’s a preposition (see “Verbs and adjectives with prepositions”, page 52). It can be followed by a noun or gerund: ⋅ ⋅

I’m looking forward to dinner.

I’m looking forward to meeting you for dinner.

Our tip: Use the present simple “I look forward to...” to sound more formal. Use the present progressive “I’m looking forward to...” to sound more relaxed.