If two or more vehicles are damaged by the same cause, what must you do?

Answer: B — Include the cause of the damage in all ads

When two or more vehicles are damaged by the same cause, it is important to include the cause of the damage in all advertisements. This is because buyers should be fully informed about the condition of the vehicles before purchasing them. Option A is incorrect because advertising the vehicles separately may not accurately convey the cause of the damage. Option C is incorrect because selling the vehicles only to a dealer for repair limits potential buyers and may result in a lower sale price. Option D is also incorrect because providing a discount does not adequately inform buyers about the cause of the damage.