When should you complete a "Motor Vehicle Purchase Contract?"

Answer: C — When you accept a down payment, deposit, or title for a trade-in vehicle

A Motor Vehicle Purchase Contract should be completed when you accept a down payment, deposit, or title for a trade-in vehicle because it is important to have a written record of all pertinent information related to the sale of a vehicle. Options A, B, and D are incorrect because waiting for the customer to sign the agreement, receive the down payment, or take possession of the vehicle can lead to delays and confusion in the sales process. Option C ensures that all necessary information is gathered and documented before any major transactions take place.