Final answer:
Jessica should recap the unique features of her design, end with a call to action for the board to hire her firm, and present a vision of the new jail's positive impact to effectively conclude her presentation.
Step-by-step explanation:
In concluding her presentation to the Nixon County Board of Supervisors, Jessica—an architect with experience in designing jails—would benefit most from using a combination of strategies. She should recap the unique features of their proposed design, as this will remind the board of the functionality and innovation her firm brings. However, to ensure a lasting impact, an effective closing would be challenging the board with a call to action to hire her firm, coupled with a vision of the positive impact of the new jail on Nixon County. This vision should highlight projected improvements in safety, rehabilitation potential, and community benefits. A testimonial from a satisfied client could also be incorporated to bolster credibility. Employing these techniques can provide a strong rhetorical or persuasive effect, especially in emphasizing the benefits the project brings to the future of the community.