In this task, you need to provide the correct option for a given problem from the provided options.

Ex Input:
Problem: the ratio of number of boys and girls in a school is 2 : 5 . if there are 490 students in the school , find the number of girls in the school ?
Options: a ) 150 , b ) 350 , c ) 300 , d ) 370 , e ) 280

Ex Output:
b

Ex Input:
Problem: how many days per calendar year is the month a factor of the day
Options: a ) 0 , b ) 1 , c ) 59 , d ) 90 , e ) 124

Ex Output:
e

Ex Input:
Problem: the contents of two vessels containing copper and tin in the ratio 1 : 2 and 2 : 5 are mixed in the ratio 1 : 4 . the resulting mixture will have copper and tin in the ratio ?
Options: a ) 15 : 32 , b ) 21 : 28 , c ) 31 : 74 , d ) 33 : 37 , e ) 41 : 92

Ex Output:
c