Final answer:
The direct object pronoun that would replace 'las chicas' in the sentence 'Veo a las chicas en el parque' is 'las'.
Step-by-step explanation:
The direct object pronoun that would replace 'las chicas' in the sentence 'Veo a las chicas en el parque' is las.
When the direct object is feminine and plural, we use the pronoun las. In this case, 'las chicas' is referring to multiple girls, so we would use 'las' as the direct object pronoun to replace it.
For example, instead of saying 'Veo a las chicas en el parque', you could say 'Las veo en el parque'. This means 'I see them in the park'.
Learn more about Spanish direct object pronouns