A qué hora llegaste?
Hace media hora lo espero, pero ahora voy a llamar a su hermana Marta. La he visto esta mañana en la biblioteca con sus amigas.
B. Ellos son.
Explanation:
Ellos translates into a masculine or mixed-gendered “They”. Son just means are.
Nosotros is out because it’s like a “we” and same goes for vosotros.
Es means is more than it means are.
Estos means these.
Number 3 would be A
Number 2 would be B
Number 1 would be C
1. to run
2. to live
3. walk
4. eat
5. to write
6. to learn
7. sell
8. to receive
9. read
10. open
Hope this helped!
Have a great day or night where ever you are. And be safe!