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: the difference between two numbers is 2395 . when the larger number is divided by the smaller one , the quotient is 6 and the remainder is 15 . the smaller number is 
Options: a ) 120 , b ) 239 , c ) 476 , d ) 523 , e ) 526
Example Output: c

Example 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
Example Output: d

Example Input: Problem: sandy bought 65 books for $ 1480 from one shop and 55 books for $ 920 from another shop . what is the average price that sandy paid per book ? 
Options: a ) $ 38 , b ) $ 18 , c ) $ 99 , d ) $ 27 , e ) $ 20
Example Output:
e