Correct option (C) meet you here
Looking forward :
(No error) This is a phrase. 'to' (no error) This is a preposition.
'Meet you here' (erroneous)
Because 'meet will be replaced with 'meeting' Phrase 'looking forward to' is followed by present participle (V. I + ing) form of the Verb.
No error : (incorrect option) Part 'C' is erroneous.