Which one of the following statements has the correct punctuation?

¡Hola, Carmen! ¿Qué hora es.

Hola, Carmen. Qué hora es?

Hola, Carmen. ¿Qué hora es?

Hola, Carmen! Qué hora es.

Respuesta :

Hola, Carmen. Qué hora es? The second one.
Definitely the third one. Whenever you are to ask a question in Spanish, you add an inverted question mark in the beginning.