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

Example Input: Problem: a man invests some money partly in 15 % stock at 105 and partly in 8 % stock at 40 . to obtain equal dividends from both , he must invest the money in the ratio : 
Options: a ) 3 : 4 , b ) 3 : 5 , c ) 7 : 5 , d ) 16 : 15 , e ) none
Example Output: c

Example Input: Problem: in a class , 9 students like to play basketball and 8 like to play cricket . 6 students like to play on both basketball and cricket . how many students like to play basketball or cricket or both ? 
Options: a ) 12 , b ) 11 , c ) 16 , d ) 18 , e ) 22
Example Output: b

Example Input: Problem: the ratio , by volume , of bleach to detergent to water in a certain solution is 2 : 25 : 100 . the solution will be altered so that the ratio of bleach to detergent is tripled while the ratio of detergent to water is halved . if the altered solution will contain 300 liters of water , how many liters of detergent will it contain ? 
Options: a ) 40 , b ) 45 , c ) 50 , d ) 75 / 2 , e ) 35
Example Output:
d