Coucou! Tu me vois ? Oui, je ____ vois. - "Hello! Do you see me? Yes, I ____"
Reflexive pronouns - te - "you" t' - "you" when the next word starts with a vowel (t'aime) la - "the" feminine l' - "the" when the next word starts with a vowel (l'eau) nous - "we" vous - "you" formal les - "the" plural
Since the sentence is informal, the answer is: Je te vois.