Answer:
The correct answer is:
Carmen y yo estamos visitando con nuestros abuelos.
Step-by-step explanation:
The present indicative in Spanish is used to place an action at the time of speech or in the very near future, to describe a routine or actions that are repeated, or to refer to stable or permanent situations.
Example:
Manolo cada martes JUEGA al fútbol. JUEGA al fútbol desde hace cinco años.
El próximo domingo su equipo PARTICIPA en un campeonato.
Hope I can help you, good luck!