Answer:
The correct answer is B
Explanation:
Economic profit is the difference among the revenue received from the sale of the output and the cost of all inputs used and opportunity cost.
Zero economic profit, it is the situation where the firm is earning the same if its resources were employed in the next alternative which is best.
When the entry barriers in the market are low, then the firm will have the tendency of having a zero economic profit in the period of long run, as the profit which is short run will attract the extra suppliers which will result in down in the market price of the product.