The following three graphs illustrate the sales of two products—Series 1 and Series 2—for each quarter of 2016. 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. b. 2016 Sales of Series 1 and 2, by Quarters 6000 4000 2000 0 1 2 3 4 Quarters Series 1 S1 Series 2 2016 Sales of Series 1 and 2, by Quarters 6000 4000 2000 Series 1 0 Series 2 1234 Quarters