Answer:
The correct answer is letter "C": the firm is at the bottom of its short run average cost curve.
Step-by-step explanation:
Competitive firms are companies that accept the equilibrium price of a given good or service within a market. If they try to raise the price, they will not be able to sell their products. It is said that in the long term a competitive firm is at the bottom of its short-run average cost curve because it portraits the most efficient level of production. That curve shows the optimal least-cost input combination for producing output.