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

Ex Input:
Problem: find the fraction which has the same ratio to 2 / 6 that 3 / 4 has to 1 / 2 
Options: a ) 1 / 2 , b ) 2 / 5 , c ) 6 / 8 , d ) 9 / 4 , e ) 7 / 5

Ex Output:
a


Ex Input:
Problem: bag a contains red , white and blue marbles such that the red to white marble ratio is 1 : 3 and the white to blue marble ratio is 2 : 3 . bag b contains red and white marbles in the ratio of 1 : 4 . together , the two bags contain 40 white marbles . how many red marbles could be in bag a ? 
Options: a ) 8 , b ) 3 , c ) 4 , d ) 6 , e ) 8

Ex Output:
a


Ex Input:
Problem: tea worth rs . 126 per kg are mixed with a third variety in the ratio 1 : 1 : 2 . if the mixture is worth rs . 153 per kg , the price of the third variety per kg 
Options: a ) 175.59 , b ) 175.5 , c ) 175.57 , d ) 175.52 , e ) 175.11

Ex Output:

c