Answer:
c. (i) and (ii) only
Explanation:
Monopolistic competition characterizes an industry in which many firms offer products or services that are similar, but not perfect substitutes. Barriers to entry and exit in a monopolistic competitive industry are low, and the decisions of any one firm do not directly affect those of its competitors.
A monopoly is a market situation in which there is only one seller of a product which has no close substitute. It is a market in which one firm has the prevailing power in the industry.
A firm in a monopolistically competitive market is similar to a monopoly in the sense that (i) they both face downward-sloping demand curves. (ii) they both charge a price that exceeds marginal cost.