Final answer:
The correct pronoun to complete the sentence is 'Ustedes.'
Step-by-step explanation:
The correct pronoun to complete the sentence "O Ustedes O Yo O TÚ H van a la clase de arte." is Ustedes. The subject pronoun "Ustedes" is used when referring to a group of people (plural) in a formal or informal manner.
Learn more about Pronouns in Spanish