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: a envelop weight 8.5 gm , if 820 of these envelop are sent with an advertisement mail . how much wieght ? 
Options: a ) 6.6 kg , b ) 6.8 kg , c ) 6.7 kg , d ) 6.97 kg , e ) 7.8 kg
Example Output: d

Example Input: Problem: ( 32323 + 7344 + 41330 ) - ( 317 x 91 ) = ? 
Options: a ) 54210 , b ) 54250 , c ) 52150 , d ) none of these , e ) 521500
Example Output: c

Example Input: Problem: if ' y ' is a positive integer exactly divisible by 4 or 5 but not divisible by 8 . what could possibly be the value of ' y ' ? 
Options: a ) 40 , b ) 80 , c ) 20 , d ) 24 , e ) 36
Example Output:
c