The following three graphs illustrate the sales of two products — Series 1 and Series 2 — for each quarter of 2011. Which is the most effective in conveying the information? Which is the least effective? What additional information would make the most effective graph better?

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a. 2011 Sales of Series 1 and 2, by Quarters 6000 4000 2000 Series 1 0 S1 Series 2 1 2 3 4 Quarters