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

Example Input: Problem: in what ratio should a 20 % methyl alcohol solution be mixed with a 50 % methyl alcohol solution so that the resultant solution has 40 % methyl alcohol in it ?
Options: a ) 1 : 3 , b ) 1 : 2 , c ) 2 : 3 , d ) 2 : 1 , e ) 3 : 1
Example Output: b

Example Input: Problem: there are 35 kids in a play school . 26 kids play with white color balls and some kids play with yellow color balls and 19 kids play with both color balls . how many kids use yellow color balls ?
Options: a ) 12 , b ) 32 , c ) 5 , d ) 28 , e ) 35
Example Output: d

Example Input: Problem: evaluate 30 ! / 28 !
Options: a ) 720 , b ) 600 , c ) 870 , d ) 910 , e ) 650
Example Output:
c