Respuesta :
B) leerían. Because they can be seen as ustedes but are not singular and not nosotros because it is not including yourself, or yo.
It’s B because, I used to have this problem when I was in Spanish class but I’m Hispanic so to me how I figured out those type of questions I would say each other and you should know which one makes sense but to me the answer to that should be B.) Leerían