The direct object pronoun would be "la" because la gasolina is feminine. In a sentence you could say
La compro en la estacion de servicio.
Direct object pronouns are placed before the verb generally.
1- el
2 c
3 d
4 d
5 d
6 b
7 c
8 d
9 c
10 b
espereto haberte ayudado pariente ;v
Mariela es alérgica a el camarón