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'.

Input: Consider Input: Problem: if ( a – b ) is 9 more than ( c + d ) and ( a + b ) is 3 less than ( c – d ) , then ( a – c ) is : 
Options: a ) 6 , b ) 2 , c ) 3 , d ) 4 , e ) 5

Output: c


Input: Consider Input: Problem: if x / y = 7 / 3 , then ( x + y ) / ( x - y ) = ? 
Options: a ) 5 , b ) 5 / 2 , c ) - 1 / 6 , d ) - 1 / 5 , e ) - 5

Output: b


Input: Consider Input: Problem: a number when divided by 221 gives a remainder 43 , what remainder will be obtained by dividing the same number 17 ? 
Options: a ) 9 , b ) 11 , c ) 15 , d ) 5 , e ) 20


Output: a