Which of the Following Descriptions Is NOT a Correct Common

Multiple Choice

Which of the following descriptions is NOT a correct common feature of mixture problem?

A) Definite resources are available in limited, known quantities for the period in question.
B) Definite products can be made by combining, or mixing the resources.
C) Each product's profit is contingent upon time.
D) The objective in a mixture problem is to find how much of each product to make so as to maximize the profit without exceeding any of the resource limitations.