Which of the following is a responsibility of a residential builder's salesperson?

A residential builder's salesperson plays a vital role in the promotion and sale of residential properties. Their primary responsibilities involve marketing and showcasing homes to potential buyers. This includes conducting open houses, creating promotional materials, and utilizing various marketing strategies to attract clients. The salesperson must understand the features and benefits of the properties being sold, enabling them to effectively communicate this information to clients and answer any questions they may have.

In contrast, administering contracts typically falls under the purview of legal professionals or brokers, while managing construction sites is primarily the responsibility of construction managers or builders who oversee the actual building process. Repairing residential buildings is a task suited for contractors or maintenance personnel rather than salespeople. Therefore, the focus of a residential builder's salesperson is fundamentally on the sales and promotion aspect of real estate, which aligns with the correct response.