Final answer:
Broker Sullivan must consider and present all three offers to Owner Mercer.
Step-by-step explanation:
In order to comply with the law, Broker Sullivan must consider all three offers and present them to Owner Mercer. Even though Sullivan firmly believes that the owner will reject all the offers, they are still obligated to follow the legal requirements and present them to the owner. This ensures that the owner has the opportunity to review and consider all the offers before making a decision.