(c) 1800
In the year 2013,
Number of two wheelers sold =6600, Number of four wheelers sold = 5700
Difference in sale = 6600 - 5700 = 900
In the year 2014,
Number of two wheelers sold =7300, Number of four wheelers sold = 6500
Difference in sale = 7300 - 6500 = 800
In the year 2015,
Number of two wheelers sold = 8100, Number of four wheelers sold = 6600
Difference in sale = 8100 - 6600 = 1500
In the year 2016,
Number of two wheelers sold =10000, Number of four wheelers sold = 8200
Difference in sale = 10000 - 8200 = 1800
Now, we find that the maximum difference between the sales of two wheelers and four wheelers is 1800 in the year 2016.