When a company makes more than one product, which is true regarding when product to emphasize?

A$.$ Emphasize the product with the highest contribution margin per unit.

B$.$ Emphasize the product with the lowest contribution margin per unit.

C$.$ Emphasize the product with the highest contribution margin per unit of the constraint $($i$.$e$,,$ number of products that can be produced in an hour$).$

D$.$ Emphasize the product with the lowest contribution margin per unit of the constraint $($i$.$e$,,$ number of products that can be produced in an hour$).$