Answer:
B) We can say that the firm is maximizing profit in the short run
Explanation:
A rational producer is at profit maximising equilibrium where : Marginal Revenue = Marginal Cost.
When MR > MC, profit is increasing & it is beneficial for firm to expand output. When MR < MC, it is loss making & it is beneficial for firm to decrease output.
If at 500 units of output : MR = MC, firm is maximising profit in short run.