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: a man is 24 years older than his son . in six years , his age will be twice the age of his son . the present age of the son is 
Options: a ) 14 years , b ) 28 years , c ) 20 years , d ) 22 years , e ) none

Output: e


Input: Consider Input: Problem: cost is expressed by the formula tb ^ 4 . if b is doubled , the new cost is what percent of the original cost ? 
Options: a ) 200 , b ) 600 , c ) 800 , d ) 1600 , e ) 50

Output: d


Input: Consider Input: Problem: a number when divided by 342 gives a remainder 47 . when the same number if it divided by 19 , what would be the remainder ? 
Options: a ) 1 , b ) 2 , c ) 5 , d ) 9 , e ) 11


Output: d