Final answer:
The best designation for a salesperson who wants to focus on working with buyers only is a Buyer Specialist.
Step-by-step explanation:
If salesperson Samuel wants to focus on working with buyers only, the best designation for him would be a Buyer Specialist (option A). A buyer specialist is a salesperson who specializes in working with buyers and helping them find and purchase properties. They have a deep understanding of the buyer's needs, preferences, and the market. By focusing on working with buyers, Samuel can develop strong relationships with potential buyers and provide them with personalized and tailored assistance in their purchasing process.