Answer:
a) Price> marginal cost.
Step-by-step explanation:
A monopoly is when there is only one firm operating in an industry. A monopoly sets the market price for its products.
A perfect competition is characterised by many buyers and sellers of homogenous goods and services. Firms in a perfect competition are price takers, they accept the prices set by the forces of demand and supply.
In a monopoly, Price> marginal cost because the marginal revenue curve is always below the demand curve . This makes a monopoly to always earn economic profit.
In a perfect competition, price = marginal cost. A perfect competition doesn't earn economic profit in the long run.
I hope my answer helps you