Respuesta :

José se ____ pone. (los pantalones)

Translation:
Jos
é puts [blank] on.

The blank must be filled with a direct object pronoun. The direct object is masculine plural (los pantalones), thus the direct object pronoun must also be masculine plural.

The options:
la - feminine singular
lo - masculine singular
las - feminine plural
los - masculine plural

Answer:
los

José se los pone.