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

Ex Input:
Problem: of the 55 cars on a car lot , 40 have air - conditioning , 25 have power windows , and 12 have both air - conditioning and power windows . how many of the cars on the lot have neither air - conditioning nor power windows ?
Options: a ) 15 , b ) 8 , c ) 10 , d ) 2 , e ) 18

Ex Output:
d

Ex Input:
Problem: the ratio , by volume , of bleach to detergent to water in a certain solution is 2 : 40 : 100 . the solution will be altered so that the ratio of bleach ( b ) 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 ) 60 , c ) 50 , d ) 30 , e ) 70

Ex Output:
b

Ex Input:
Problem: the simple form of the ratio 4 / 3 : 4 / 5 is ?
Options: a ) 10 : 6 , b ) 10 : 3 , c ) 15 : 3 , d ) 5 : 3 , e ) 30 : 3

Ex Output:
d