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: how many positive integers less than 100 have a remainder of 6 when divided by 13 ? 
Options: a ) 2 , b ) 7 , c ) 6 , d ) 9 , e ) 10

Ex Output:
c


Ex Input:
Problem: in a theater , the first row has 12 seats and each row has 2 more seats than previous row . if the last row has 48 seats , what is the total number of seats in the theater ? 
Options: a ) 550 , b ) 570 , c ) 590 , d ) 610 , e ) 630

Ex Output:
b


Ex Input:
Problem: find the average of all the numbers between 16 and 34 which are divisible by 5 ? 
Options: a ) 10 , b ) 20 , c ) 28 , d ) 30 , e ) 15

Ex Output:

c