In which case can a Wisconsin dealer legally adjust the purchase price of an order-out vehicle?

Answer: B — Changes by the manufacturer in the vehicle's base price

Manufacturers may occasionally make changes to the base price of a vehicle, which can affect the purchase price for a dealer. This is the only option that addresses circumstances that are beyond the control of the dealer. Changes in chassis year, interior color preferences, and tire specifications are all choices that can be controlled by the dealer and therefore cannot legally justify a price adjustment.