Answer:
c. both a monopoly and a competitive firm
Explanation:
A monpolistically competitive firm is a firm that has the features of both a monopoly and a competitive firm
Characteristics of a monopoly in a monpolistically competitive firm:
1. Products are differentiated in a monpolistically competitive firm.
2. Firms are price setters.
Characteristics of perfect competition in a monpolistically competitive firm:
1. There is free entry and exist into the industry.
2. There are many sellers