hting, Fifth Canadi... Ch 6: Decision-Making: Cost-Volume-Profit (1 of 21) Q 6.1: Which of the following statements expresses an underlying assumption of cost-volume-profit analysis? Changes in activity and other factors affect costs. B All costs can be classified as either variable or fixed with reasonable accuracy. The behavior of both costs and revenues is curvilinear throughout the entire range of the activity index. D All units produced are either sold or in ending inventory