Which One of the Following Describes the Way in Which

Which one of the following describes the way in which limiting factor analysis uses contribution and relevant cost analysis?

A) Total fixed costs divided by contribution per unit of sales.
B) Using relevant cost and contribution analysis to determine whether accepting an order to supply goods at lower than the usual selling price will increase or decrease overall profit.
C) Using relevant cost analysis to determine whether it is more cost effective to produce products inside an organization or to buy them in from outside.
D) Calculating the contribution per unit of a scarce resource to determine the profit maximizing production plan.