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 variety of rice costing rs . 10 per kg be mixed with another variety of rice costing rs . 13.25 per kg to obtain a mixture costing rs . 10.75 per kg ? 
Options: a ) 2 : 1 , b ) 1 : 2 , c ) 5 : 1 , d ) 4 : 1 , e ) 3 : 1
Example Output: a

Example Input: Problem: a firm is comprised of partners and associates in a ratio of 2 : 61 . if 60 more associates were hired , the ratio of partners to associates would be 4 : 137 . how many partners are currently in the firm ? 
Options: a ) 12 , b ) 14 , c ) 16 , d ) 18 , e ) 20
Example Output: c

Example Input: Problem: the l . c . m . of two numbers is 48 . the numbers are in the ratio 2 : 3 . then sum of the number is : 
Options: a ) 28 , b ) 32 , c ) 40 , d ) 53 , e ) 54
Example Output:
c