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.
Answer:
Tu tienes mi número de teléfono
Explanation:
The answer is B. TIENES.
Puedes hablar sobre "cumpleaños de alguien" o "el primer día de clases"
