A. Un cuento
because cuento means story
Not puerta because that is door
nor is it casa because that is house
and it is not calle because that is like streets or neighborhood
You use preterite to describe an action that took place and was fully done, Ex. José entro a la habitación, you can see John went into the room, he completed the action. On the other hand, imperfect tense doesn't specificate if the action was completed, Ex. José entraba a la habitación, it doesn't tell us if José fully entered the room.
Response:
Me encantan las sillas que ustedes venden, pero me parece que el precio esta costoso.
Best regards
