Question

¿Qué frase usa los verbos correctamente según la regla de actividades simultáneas?

Answer 1

The second choice uses two different times for the two verbs. Its wrong. 
The first choice does make sense but its in past tense. 
The third choice is in present tense as to what both groups of people are doing right now in different places.
I think its the third choice because of this. 

Hope that helps! Buena suerte y buen dia!