Which statement is true regarding the use of dealer demo plates?

Dealer demo plates serve a specific purpose within the context of vehicle sales and dealership operations. They are primarily intended for use on vehicles that are used for demonstration purposes, test drives, and certain dealership-related activities.

When it comes to the use of these plates, they are typically affixed to vehicles owned by the dealership to allow potential buyers to experience the vehicle's capabilities and features firsthand. This aligns with the function of demo plates, which is to facilitate the sales process and promote vehicles available for sale.

In contrast, other options describe scenarios that do not align with the intended use of dealer demo plates. For example, using them on vehicles being delivered to purchasers or loaning them for personal use does not fall under acceptable practices, as these activities can compromise the regulatory framework that governs dealer plates. Additionally, loaning them to charitable organizations would likewise misuse the intended purpose, as these plates are specifically for dealership use rather than for external organizations or private individuals.

Thus, the accurate understanding of dealer demo plates lies in their application exclusively to dealership-owned vehicles, making that statement true.