Answer: Option (b) is correct.
Explanation:
In a monopoly market condition, there is a single firm operating in a market and it is a price setter. Monopolist have the capability to earn abnormal profits in the short run as well as in the long run.
The price that is set by the monopolist can't be influence by the other firms because there is a high barriers to entry into the market. Hence, monopolist may earn profits in the short run and may also earn economic profits in the long run.