The given bar graph shows the income and expenditure (in crores ₹) of a company over 5 years, from 2014 to 2018.
Study the bar graph and answer the question that follows.

What is the difference (in crores ₹) between the expenditure for the years 2017 and 2018 taken together and the income for the years 2015 and 2016 taken together?

A

15

B

16

C

18

D

20