Answer:
A. are dependent upon the costs of a firm's inputs
Step-by-step explanation:
Isocosts are lines showing the various combinations of inputs which costs the same total amount. That is, all inputs combinations with similar cost. It indicates a combination of inputs that an organization or firm can buy or rent at a given cost/price. The isocosts are simply dependent upon the cost of the firm's input, that is to say, the cost of inputs determines the various combination possible. Isocost becomes very important when analyzing a firm's or producer's behavior.