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

Input: Consider Input: Problem: from a container having pure milk , 20 % is replaced by water and the process is repeated thrice . at the end of the third operation , the milk is
Options: a ) 40 % pure , b ) 50 % pure , c ) 51.2 % pure , d ) 58.8 % pure , e ) none

Output: c

Input: Consider Input: Problem: in a group of people , if 30 people were made to stand in each column , 16 columns could be formed . if 12 people were made to stand in a column , how many columns could be formed ?
Options: a ) 20 , b ) 30 , c ) 40 , d ) 50 , e ) 60

Output: c

Input: Consider Input: Problem: the h . c . f of two numbers is 23 and the other two factors of their l . c . m are 14 and 15 . the larger of the two numbers is :
Options: a ) 338 , b ) 278 , c ) 345 , d ) 231 , e ) 121
Output: c