Figure 14-2 A graph of Cost versus Quantity, shows 4 cost curves, as follows. Curve A decreases from left to right, at a slower rate as quantity increases. Curve B is a straight line which increases from left to right. Curve C decreases rapidly initially, then reaches a minimum after which it increases consistently with quantity. Curve D is a straight line which increases at a faster rate than Curve B. Refer to Figure 14-2. Curve A represents which type of cost curve? a. Average total cost b. Marginal cost c. Average fixed cost d. Average variable cost