find profit-maximizing profits from the graph, economics homework help

If the price is $6 then profit-maximizing profits for this firm are:

A. need more information
B. $60
C. $300
D. $360

I believe I need more information in order to find profit-maximizing profits from the graph.

I know that Profit Maximization is Marginal Cost = Marginal Revenue, but I feel like that would be too easy of an answer.

Part of me wants to just assume that $6 (price) times 60 (quantity) = $360 would be the correct answer, but please correct me if I am on the wrong track.

Thank you!

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