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

Ex 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

Ex Output:
c


Ex Input:
Problem: what is the greatest positive integer r such that 3 ^ r is a factor of 9 ^ 10 ? 
Options: a ) r = 5 , b ) r = 9 , c ) r = 10 , d ) r = 20 , e ) 30

Ex Output:
d


Ex Input:
Problem: the h . c . f of two numbers is 23 and the other two factors of their l . c . m are 13 and 14 . the larger of the two numbers is : 
Options: a ) 338 , b ) 278 , c ) 322 , d ) 231 , e ) 121

Ex Output:

c