I believe that it would be B (reloj) since it is talking about how there is a window, a door and then a clock in a classroom.
It is also giving you the masculine singular form indicating that it can only be reloj.
Answers:
¿le escribe rolando un mensaje electrónico a miguel?
Does Rolando write an email to Miguel?
¿nos trae el botones las maletas a la habitación?
Does the bellboy bring the suitcases to the room?
¿les dan gafas de sol los vendedores a los turistas?
Do the vendors give sunglasses to tourists?
¿te compra botas en el invierno tu mamá?
Does mom buy you, boots in the winter?
¿les muestra el traje a ustedes el dependiente?
Does the dependent show you the suit?
¿me vas a buscar la revista en la librería?
Are you going to look for my magazine in the bookstore?
Hope this helps!
Explanation:
i think this is the answer