Consider the Following Figure That Shows a Competitive Firm on the Left

Consider the following figure that shows a competitive firm on the left panel and a competitive market on the right panel. The movement along the curve S from point E to E' in the right panel of the figure represents: ​
Figure 8.8
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A) an increase in the number of firms in the industry.
B) an increase in output supplied by each firm in the industry.
C) both an increase in the number of firms in the industry and an increase in each firm's output.
D) an increase in the cost of production for the firms in the market.
E) an increase in total revenue of the representative firm from $8 to $12.