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: how many even 4 - digit numbers can be formed , so that the numbers are divisible by 4 and no two digits are repeated ? 
Options: a ) 336 , b ) 784 , c ) 1120 , d ) 1804 , e ) 1936
Example Output: c

Example Input: Problem: what is the remainder when 14,452 × 15,652 × 16,781 is divided by 5 ? 
Options: a ) 0 , b ) 1 , c ) 2 , d ) 3 , e ) 4
Example Output: e

Example Input: Problem: the sum of the squares of three numbers is 41 , while the sum of their products taken two at a time is 20 . their sum is : 
Options: a ) 10 , b ) 5 , c ) 9 , d ) 15 , e ) none of these
Example Output:
c