The answer is Cuantos anos tienes. I hope this helps.
Answer Un grupo de mulatos que solo hablaban el español y vigilaban a los trabajadores.
Answer is B because it blocks the flow of
Electrical or thermal currents
It should be C. Esas.
Because "esas" means them/they, but in feminine form. So if we translate the sentence it would be: "Those/The girls in the picture are my cousins Malena and Alejandra"
Hope that helped :D