Final answer:
The broker should present all offers at the same time to the seller, to ensure a fair and unbiased approach and enable the seller to make an informed decision.
Step-by-step explanation:
When a broker receives multiple offers on a listing, professional ethics and real estate regulations typically require that all offers be presented to the seller without bias. Accordingly, in this situation, the broker should proceed as follows: b. All offers should be presented at the same time. This ensures that the seller can evaluate each offer's merits and make an informed decision. Presenting offers in the order they were received (a) or suggesting prioritizing one over the other as a primary or backup offer (d) may demonstrate bias or preference. Informing the seller of all available options, including the fact of multiple offers (c), is also important, but it is essential that the actual offers be presented simultaneously, so the seller is aware of the full scope of interest in the property.