Given:
The given circle graph shows the number of hours a college student spends studying each subject.
To find:
Which subject gets 30% of the students study time?
Solution:
From the given circle graph, we get study time of following subjects:
Art = 10 hr
P.E. = 6 hr
History = 13 hr
English = 5 hr
Math = 9 hr
Total study time is:

30% of 43 hr is:


It means 30% of 43 hr is about 13 hr.
Since study time of History is 13 hr, therefore History gets 30% of the students study time.
Hence, the correct option is C.