Answer :
Answer: D. more elastic is the Monopolistic competitive firm's demand curve
Explanation:
Monopolistic competitive firm's market power stems from the fact that they sell differentiated product with no close substitute and they are protected by market entry barriers preventing other firms from entering the market.
Product differentiation and market entry barriers allows firms to change prices and still make profits because they are facing a demand that is inelastic as consumers do not have much of a choice but to buy the product of the monopolistic competitive firm.
When the number of firms in the market increases and products become less differentiated, the monopolistic competitive firm losses its grip on the market, The firm looses its Market power.
The monopolistic competitive firm will now face a demand curve that is more elastic because consumers now have a choice since there is a large number of firms in the market with a low degree of product differentiation.
the larger the number of firm and smaller degree of product differentiation the more elastic is the monopolistic firm's demand curve