Hint : what is established is what is there. Since you need 16 letters, we will use it in plural, establishments.
Answer : Establecimientos.
Hope this helps!
1. Los niños están jugando
2. Yo estoy leyendo
3. Nosotros estamos comiendo
Good luck
The answer will be B.Cuesta
Saludos, Irys :)
I'm sure the answer is "C".