Discussion

Explanation:

The following table shows the sales of C, D and E together in the given years and the respective increase in the sales.

Years Sales of C, D and E Increase in sales
2007-08 820 -
2008-09 940 120
2009-10 1040 100
2010-11 1200 160
2011-12 1380 180
2012-13 1520 140
2013-14 1720 200

Clearly, the required increase is the highest in 2013-14.

Hence, option (c).

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