Study the following graph that shows the number of boys and girls who appeared for the Class X examination in a school XYZ, in different years.

What is the ratio of the total number of boys who appeared for the Class X examination in 2012 and 2013 to that of girls who appeared in 2012 and 2015?

A

11 : 15

B

11 : 13

C

15 : 11

D

13 : 11