B. estudiosas. hope this helped!
Correcto. Muy bien. Tehaha
I would say para. Because para means "to" and the sentence is saying "my brother bought a bike to ride in the mountains"
1. Concierto
2. Grupo musical
3. Cantante
4. Álbum
5. Discos compactos
6. Boletos
7. Taquilla
8.Divertir
9. Espectáculo
10. Audiencia