I have some serious doubts between A and B. On one hand, given that each oligopolistic firm follows the same profit maximization rule as that of a monopolistic one, it's the basic rule of MR = MC, and then map the price from the demand curve which is price point A. Since the price will be determined along the demand curve and it will be determined at the kink, the answer should be option A.
However, even though firms maximize profit by producing that quantity where MC=MR, the firms will not change the price of their product as long as the marginal cost is between MC1 and MC3. Hence, B should be the answer.
Can someone please help with what's correct?