Final answer:
The most appropriate object pronoun to fill in the blank is 'me'.
Step-by-step explanation:
In the given dialogue, the most appropriate object pronoun to fill in the blank is me.
The correct response would be:
-¿Me escuchas?
-Sí, te escucho atentamente.
Here, the speaker is asking if the other person can hear them. The appropriate object pronoun to use in response is 'te', which means 'you' in this context.
Learn more about Object Pronouns in Spanish