substitute "la gasolina" with a direct object pronoun and explain why you used the pronoun you did

Question

Compro la gasolina en la estacion de servico
simplify the answer

Answer 1

"Compro la gasolina en la estación de servicio" can be changed to "La compro en la estación de servicio."

Here, "la" is the direct object pronoun that replaces "la gasolina." I used "la" because "gasolina" is a feminine singular noun in Spanish, and "la" is the appropriate pronoun for feminine singular direct objects.