Answer:
c) is probably in a monopolistically competitive industry.
Step-by-step explanation:
A monopolistically competitive industry is characterised by many buyers and sellers of differentiated goods and services.
Sellers set the prices for their products and sellers have a downward sloping demand curve.
A perfect competition is characterised by many buyers and sellers of homogenous goods and services.
An oligopoly is characterised by few large firms.
A monopoly is when there's only one firm operating in the industry.
I hope my answer helps you