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

Input: Consider Input: Problem: the ratio of toddlers to infants at a day care center is 7 to 3 . if 12 more infants join the day care to change the ratio to 7 to 5 , how many toddlers are there at this day care center ?
Options: a ) 24 , b ) 36 , c ) 42 , d ) 72 , e ) 120

Output: c

Input: Consider Input: Problem: in a certain pet shop , the ratio of dogs to cats to bunnies in stock is 3 : 7 : 12 . if the shop carries 375 dogs and bunnies total in stock , how many dogs are there ?
Options: a ) 42 , b ) 66 , c ) 75 , d ) 112 , e ) 154

Output: c

Input: Consider Input: Problem: on a certain farm the ratio of horses to cows is 4 : 1 . if the farm were to sell 15 horses and buy 15 cows , the ratio of horses to cows would then be 13 : 7 . after the transaction , how many more horses than cows would the farm own ?
Options: a ) 30 , b ) 60 , c ) 75 , d ) 90 , e ) 105
Output: a