Answer:
D. If demand is downward sloping, P > MR.
Step-by-step explanation:
Demand curve is plotted on graph on axis of price and quantity. Downward sloping demand curve means to increase quantity demanded (to sell more) it is necessary to sell at lower price.
Marginal revenue is the additional revenue from selling one more unit . As price has to go down to sell more, additional revenue will be less than current price.