Luis: Fui al mall para comprar un regalo para el cumpleaños de mi hijo y el regalo con mi tarjeta de crédito. A.
pagar
B.
pagaste
C.
pagó
D.
pagué

Pague

Explanation:

Pague means to pay something. It's past-tense.

D - Pague

Explanation:

- Pagó is when you are talking about someone else EX: She paid for this. = Pagó por esto.

- Pagaste is when you are talking directly to that person. EX: You Paid for this, thank you = Pagaste por esto, gracias.

- Pagar is the action of purchasing an item. EX: You have to buy it first. = Tienes que pagar por eso primero.