Which of the following is considered acceptable proof of ownership of a motor vehicle for a Colorado dealer?

In Colorado, acceptable proof of ownership for a motor vehicle is typically demonstrated through the vehicle's title. A vehicle that is subject to a lien on the title can still serve as acceptable proof of ownership, as it legally indicates that the owner has possession of the vehicle, even if there is a financial obligation attached to it. This is important in transactions involving dealers, as it confirms that the seller has legal rights to the vehicle, despite the lien.

Other options, while they may relate to ownership in some context, do not provide the same level of legal affirmation regarding the vehicle's ownership status. A signed agreement to purchase does not signify ownership until the transaction is finalized and the title is transferred. A bill of sale serves as a record of a transaction rather than proof of ownership; it does not provide a definitive legal claim to the vehicle without the associated title. Similarly, a personal assurance of ownership is not a documented form of proof, lacking the necessary legal backing to confirm ownership rights. Thus, only a vehicle under a lien on the title meets the legal requirements for verifiable ownership in this case.