Final answer:
The correct answer is 'Van', which means 'you all go'.
Step-by-step explanation:
The correct answer to fill in the blank in the dialogue is Van, option A.
The verb form 'Van' is the second person plural of the verb 'ir' which means 'to go' in Spanish. It is the appropriate form to use when expressing 'you all' or 'Uds.'
For example, in the dialogue, 'Adónde van Uds. esta noche?' translates to 'Where are you all going tonight?'
Learn more about Verbs in Spanish