Graph 15-2 This Graph Reflects the Cost and Revenue Structure

Graph 15-2
This graph reflects the cost and revenue structure for a monopoly firm. Use the graph to answer the following question(s) .
-Refer to Graph 15-2. Profit can always be increased by decreasing the level of output by one unit if the monopolist is currently operating at which of the following output levels? (i) Q₀
(ii) Q₁
(iii) Q₂
(iv) Q₃

A) (i) or (ii)
B) (i) , (ii) or (iii)
C) (iii) or (iv)
D) (iv) only