Answer :
The house in which Ramirez lives in house number A.
Explanation:
From the information given above in the question it becomes a little possible to find the correct house which belongs to Ramirez. Because in the house B, live the elderly couple.
In house C, lives the retired couple. House D has a couple living in it who has a new born baby. House E has been sold out and therefore it is vacant. So the house that is left is house A.