Final answer:
The correct direct object pronoun to complete the conversation is 'lo'
Step-by-step explanation:
The correct direct object pronoun to complete the conversation is A. lo. In Spanish, the direct object pronoun for a singular masculine object is 'lo'. Since Fernando is talking about buying clothing (ropa) for the party, the pronoun 'lo' is used to refer to it.
Learn more about Direct object pronouns in Spanish