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

Example Input: Problem: a certain fruit stand sold apples for $ 0.70 each and bananas for $ 0.60 each . if a customer purchased both apples and bananas from the stand for a total of $ 6.30 , what total number of apples and bananas did the customer purchase ? 
Options: a ) 8 , b ) 9 , c ) 10 , d ) 11 , e ) 12
Example Output: c

Example Input: Problem: two numbers are in respectively 10 % and 40 % more than a third number . the ratio of the two numbers is ? 
Options: a ) 11 : 14 , b ) 7 : 9 , c ) 17 : 25 , d ) 15 : 26 , e ) 2 : 3
Example Output: a

Example Input: Problem: if m = 3 ^ n , what is the greatest value of n for which m is a factor of 28 ! 
Options: a ) 13 , b ) 10 , c ) 12 , d ) 14 , e ) 16
Example Output:
a