The given graph shows the production of cotton cloth (in lakh metres) by three companies A,
B and Cover the years. Study the graph and answer the question that follows. 

What is the difference (in lakh metres) between increase in the production by company A
from 1998 to 1999 and that by company C from 1996 to 1997?

A

21

B

13

C

11

D

1