In which of the following years was the percentage increase in production from the previous year the maximum among the given years?

Difference in the production of food-grains between 1991 and 1994 = Production of food-grains in 1991 - Production of food-grains in 1994
Put the value by seeing the graph
Difference in the production of food-grains between 1991 and 1994 = ( 60 ? 50 ) x 1000 = 10 x 1000 = 10,000

As per given graph in question,
The average production of 1990 and 1991 = (40 + 60)/2 = 100/2 = 50
The average production of 1991 = 60
Solve one by one option.
(A) The average production of 1991 and 1992 = (60 + 45)/2 = 105/2 = 52.5
(B) The average production of 1992 and 1994 = (45 + 50)/2 = 95/2 = 47.5
(C) The average production of 1993 and 1994 = (65 + 50)/2 = 115/2 = 57.5
(D) The average production of 1994 and 1995 = (50 + 75)/2 = 125/2 = 62.5

All the given option doesn't have average production of 50. So answer will be none of these.

Total rose production = ( 15000 + 12500 + 12450 + 20000 + 12400 + 22500 + 22400 + 25000 ) = 142250
% Rose Production increase in State = Rose production in state x 100 / Rose production in All state
% Rose Production increase in Gujrat = Rose production in Gujrat x 100 / Rose production in All state
% Rose Production increase in Gujrat = 15000 x 100 / 142250
% Rose Production increase in Gujrat = 1500 x 100 / 14225
% Rose Production increase in Gujrat = 300 x 100 / 285
% Rose Production increase in Gujrat = 60 x 100 / 57
% Rose Production increase in Gujrat = 6000 / 57 = 10.54 %
Similarly Calculate the % Rose Production increase in all states one by one and compare them.

Percentage production of rose in the States (the lowest four states)

It is 36.8% approximately.