Narly Skateboards manufactures three different product lines, Base, Long, and Trick. Considerable market demand exists for all models. The following per unit data apply:

	Base Model	Long Model	Trick Model
Selling price	$100	$120	$140
Direct materials	12	12	12
Direct labor ($12 per hour)	24	24	48
Variable support costs ($4 per machinehour)	8	16	16
Fixed support costs	20	20	20

How can the Vicepresident of sales at Skate Magic encourage her salespeople to promote the more profitable model?

A. Provide higher sales commissions for higher priced items and items with the greatest contribution margin per constrained resource.

B. Provide higher sales commissions for higher priced items.

C. Put all sales persons on salary.

D. Provide higher sales commissions for items with the greatest contribution margin per constrained resource.