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'.

Ex Input:
Problem: each child has 6 crayons and 12 apples . if there are 12 children , how many crayons are there in total ? 
Options: a ) 22 , b ) 65 , c ) 72 , d ) 78 , e ) 90

Ex Output:
c


Ex Input:
Problem: ( x + 3 ) is a factor in x ^ 2 - mx - 15 . what is the value of m ? 
Options: a ) 1 , b ) 2 , c ) 3 , d ) 4 , e ) 5

Ex Output:
b


Ex Input:
Problem: the ratio of expenditure and savings is 3 : 2 . if the income increases by 15 % and the savings increases by 6 % , then by how much percent should his expenditure increases ? 
Options: a ) 22 , b ) 21 , c ) 88 , d ) 76 , e ) 29

Ex Output:

b