Final answer:
The correct form of the verb volver to use in the sentence is vuelvan.
Step-by-step explanation:
The correct form of the verb volver to use in the sentence is vuelvan. We can determine this by looking at the subject of the sentence, which is Uds., the abbreviation for ustedes (you all). In Spanish, the third-person plural form of the verb volver is vuelven, but since the sentence is using the subjunctive mood ('Ojalá que'), we need to use the subjunctive form, which is vuelvan. This form matches the subject 'Uds.' and fits the context of expressing a wish or hope.
Learn more about verb conjugation in Spanish