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: the average of the marks of 30 students in a class is 45 . if the marks of each student are doubled , find the new average ? 
Options: a ) 85 , b ) 77 , c ) 33 , d ) 90 , e ) 75

Ex Output:
d


Ex Input:
Problem: on the number line , the number p is twice as many units from - 2 as - 2 is from 2 . if p is less than – 2 , what is the value of p ? 
Options: a ) – 18 , b ) – 10 , c ) – 6 , d ) 10 , e ) 14

Ex Output:
b


Ex Input:
Problem: 4,25 , 49,121 , 169,289 , 361,529 , 
Options: a ) 149 , b ) 169 , c ) 841 , d ) 920 , e ) 219

Ex Output:

c