What must you ensure before writing a purchase contract for a used vehicle?

Answer: B — The vehicle has been inspected and the Wisconsin Buyers Guide is displayed

Before writing a purchase contract for a used vehicle, it is important to ensure that the vehicle has been inspected and that the Wisconsin Buyers Guide is displayed. This is necessary to ensure that the vehicle is in good condition and accurately represented to potential buyers. A, C, and D may also be important factors to consider, but they are not specifically related to the immediate task of writing a purchase contract. For example, while it is important for the vehicle to have been serviced, this does not guarantee that it has been inspected or that the Buyers Guide is displayed. Similarly, while a vehicle history report can provide valuable information, it is not a requirement for writing a purchase contract. Lastly, contacting the previous owner may be helpful in obtaining information about the vehicle, but it is not always necessary or possible. Therefore, B is the most important and relevant factor to consider before writing a purchase contract for a used vehicle.