Sparkle is one firm of many in the market for toothpaste, which is in long-run equilibrium. Indicate which of the following graphs accurately reflects Sparkle's demand curve, marginal-revenue (MR) curve, average-total-cost (ATC) cu marginal-cost (MC) curve. A B Demand Demand Price, Cost, Revenue ATC Price, Cost, Revenue ATC MC MC MR MR Quantity of Sparkle Toothpaste Quantity of Sparkle Toothpaste