​Mechanisms that manufacturers can use to deal with misaligned retailer incentives include

A) ​setting a minimum retail price
B) providing an exclusive contract to a single retailed in a market
C) compensating retailers' sales staff for demonstrating,as well as selling,the product
D) ​All of the above

The best choice is D because setting a minimum retail price can prevent retailers from lowering the price too much, providing an exclusive contract to a single retailer can ensure that the retailer is fully committed to selling the product and not promoting competitors, and compensating retailers' sales staff for demonstrating the product can incentivize them to educate customers about the product, leading to increased sales. Therefore, using all three of these mechanisms can help manufacturers deal with misaligned retailer incentives.