What information and documents must be provided to customers when you are offering a vehicle for sale?

Answer: C — Proper vehicle information

Proper vehicle information must be provided to customers when offering a vehicle for sale. This includes information such as the make, model, year, mileage, and any known mechanical issues or past accidents. A Interest rate details are not relevant to this question as they pertain to financing, which is a separate process from the actual sale of the vehicle. B: While insurance options may be offered as an additional service, they are not required to be provided to customers when selling a vehicle. D: Upgraded features may be included in the sales pitch, but they are not necessary information for customers to have when considering purchasing the vehicle.