¿Tus amigos compraron algo anteayer?
Answer : a.) Mis amigos no compraron nada.
Explanation : The question refers to "Tus amigos", so the answer should refer to "Mis amigos".
Hope this helps!
this is the answer
Solíamos ir a las montañas cada invierno
Most of the Tenochtitlan died of Smallpox, a disease brought by the Spanish.