Final answer:
A Single Agent's duties concerning offers involve disclosing all offers to the client and negotiating on their behalf.
Step-by-step explanation:
A Single Agent's duties concerning offers in a business context involve the responsibility to disclose all offers to the client. This means that the agent must inform the client about any offers received, whether they are buying or selling a product or service.
While the agent must present all offers to the client, they do not have to accept all offers on behalf of the client. The final decision to accept or reject an offer rests with the client, and it is the agent's duty to negotiate offers on behalf of the client.
Therefore, the correct answer to the question is a) A Single Agent must disclose all offers to the client.