Correct Answer: (c) Monopolistic Competition
Solution:Under monopolistic competition where the product is differentiated, selling costs are essential to push up sales. They are incurred to persuade a buyer to purchase one product in preference to another. Selling costs are the expenses on advertisement, salesmanship, free sampling, free service, door-to-door canvassing, and so on. There is no selling problem under perfect competition where the product is homogeneous.