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Question:

In which year, ratio of annual change in Style_Spend to annual change in Sentiment_Index is highest ?

Explanation:

For the years given below, we can calculate the corresponding ratios from the data given in the figure: 

2011 Style spend = 400-300 = 100

2011 sentiment index = 60 - 50 =10

2011 ratio = 100/10 = 10

2012 Style spend = 100

2012 sentiment index = 10

2012 Ratio = 10

2014 Style spend = 400

2014 sentiment index = 30

2014 Ratio = 13.33

2017 style spend = 100

2017 sentiment Index = 10

2017 Ratio =10

Hence, option (c)