La señora Rodrigo es LA HERMANA del señor Cartas.
La palabra que debes añadir es "pueda"
The answer is A. "El maletero."
El maletero means the trunk, which is where you can safely store things in a car. The other choices include different parts of a car, but none of which are suitable for storage.
Las puertas - the doors
Los asientos - the seats
Los espejos laterales - side mirrors
Las luces delanteras - front lights