Final answer:
The correct sentence substitution is 'Carla los compró.'
Step-by-step explanation:
The correct sentence to substitute the bolded phrase is Carla los compró.
In Spanish, when the direct object is plural and masculine, we use the pronoun 'los.'
For example, if we have 'anteojos de sol' (sunglasses), which is a plural and masculine noun, we would use 'los' as the pronoun to replace it.
Learn more about Substituting direct object pronouns in Spanish