Here's why:
* "Sillas" is plural and feminine.
* "Las" is the plural feminine direct object pronoun.
The complete sentence is:
Fernando: Tuve que comprar unas sillas.
Víctor: ¿Dónde compraste las?
Here's why:
* "Sillas" is plural and feminine.
* "Las" is the plural feminine direct object pronoun.
The complete sentence is:
Fernando: Tuve que comprar unas sillas.
Víctor: ¿Dónde compraste las?