It is clear from the pie-chat that percentage of students in college E and percentage of girls in collage is minimum.
Hence, college E has lowest number of girls.

As per second graph,
Total number of girls = 1800
Number of girls in College D = Total Number of Girls x 11%
? Number of girls in College D = 1800 x 11%
? Number of girls in College D = 1800 x 11/100
? Number of girls in College D = 18 x 11 = 198

As per first graph,
The number of students in Collage E = Total number of students x 7%
As per second graph,
The number of girls from College E = Total number of girls x 8%
So number of boys in Collage E = The total number of students in Collage E - The total number of girls in Collage E.
Number of boys from college E = 3500 x 7/100 - 1800 x 8/100
Number of boys from college E = 35 x 7 - 18 x 8
Number of boys from college E = 245 - 144 = 101
Similarly for collage F also apply the same formula.
Number of boys from college F = 3500 x 12/100 - 1800 x 17/100 = 420 - 306 = 114
Hence, the total number of boys together in collage E and F = 101 + 114 = 215

As per first graph,
The number of students in Collage A = Total number of students x 21%
The number of students in Collage A = 3500 x 21/100
The number of students in Collage A = 35 x 21 = 735
As per second graph,
The total number of girls from College A = Total number of girls x 23%
The total number of girls from College A = 1800 x 23/100
The total number of girls from College A = 18 x 23 = 414
Number of boys from college A = Total number of students in Collage A - The total number of girls from College A
Since, number of boys from college A = 735 - 414 = 321
Required percentage = 100 x Number of Boys from Collage A / Total number of boys in collage A
Required percentage = 100 x 321/735
Required percentage = 2140/49 = 43.67%

From above given pie-chart ,
It is clear that Maximum expenditure of the family other than on food is on others .
Hence Required Answer will be on others ( 20% ) .

From above graph , we have
Expenditure on clothing = 10%
Expenditure on education of children = 12%
Expenditure on transport = 5%
? Total Expenditure = Expenditure on clothing + Expenditure on education of children + Expenditure on transport
Total Expenditure = 10% + 12% + 5% = 27%

As per given chart , we can see that
The savings of the family for the year is equal to the expenditure on housing.
Hence ,correct option is B.