Study the given graph and answer the question that follows.
The given graph represents the percentage of books on different subjects that a person has in his library.

image

If the total number of books is 60, then what is the ratio of the number of books on subject Cl to the average number of books per subject?

A

3 : 7

B

2 : 3

C

3 : 5

D

2 : 5