In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: √ ( 36 ) ^ 2 
Options: a ) 6 , b ) 14 , c ) 36 , d ) 21 , e ) none of these
Example Output: c

Example Input: Problem: evaluate 248 + 64 − − √ − − − − − − − − − √ 
Options: a ) 14 , b ) 26 , c ) 16 , d ) 36 , e ) 46
Example Output: c

Example Input: Problem: the contents of a certain box consist of 72 apples and 30 oranges . how many oranges must be added to the box so that exactly 30 % of the pieces of fruit in the box will be apples ? 
Options: a ) 68 , b ) 78 , c ) 88 , d ) 138 , e ) 108
Example Output:
d