Graph 14-4 This Graph Depicts the Cost Structure of a Profit-Maximising

Graph 14-4 This graph depicts the cost structure of a profit-maximising firm in a competitive market.Use the graph to answer the following question(s) .
-Refer to Graph 14-4.Which line segment best reflects the long-run supply curve for this firm?

A) AB
B) CD
C) DE
D) none of the above; the long-run supply curve requires knowledge of the average variable cost structure