La respuesta es la c, Camarero
Answer: Yo soy optimista
I am optimistic
Explanation: The subject in this sentence is "Yo", that is a first-person in the singular, so the verb must be conjugated in this form. Yo soy.

Entenderte
Bailarte
Preguntarte
Recibirte
Oírte
Native speaker, hope it helps !!
Answer:
ummmm no voy a leer todo eso pero me parece wue si
Explanation: