Chip Corporation Produces Three Products, with Costs and Selling Prices

Chip Corporation produces three products, with costs and selling prices as follows:
Each product requires a certain number of minutes on the drill press. There is only one drill press available so it is the constraint for this product. Model A2 requires 2 minutes of drill press time, Model D4 requires 1 minute of drill press time, and Model C6 requires 7 minutes of drill press time. In what order should Chip Corporation emphasize its products to maximize its contribution margin? (Rank the products in order from most profitable to least profitable in terms of contribution margin per unit of capacity.)

A) Model A2, Model C6, Model D4
B) Model C6, Model D4, Model A2
C) Model D4, Model A2, Model C6
D) Model A2, Model D4, Model C6