In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: an article is bought for rs . 980 and sold for rs . 788 , find the loss percent ? 
Options: a ) 16 % , b ) 19 % , c ) 17 % , d ) 13 % , e ) 12 %
Example Output: b

Example Input: Problem: $ 2,000 is deposited in a savings account that pays 4 % annual interest compounded semiannually . to the nearest dollar , how much is in the account at the end of the year ? 
Options: a ) $ 2125.15 , b ) $ 2083.12 , c ) $ 2184.22 , d ) $ 2150.84 , e ) $ 2080.80
Example Output: e

Example Input: Problem: a survey was sent to 65 customers , 7 of whom responded . then the survey was redesigned and sent to another 63 customers , 9 of whom responded . by approximately what percent did the response rate increase from the original survey to the redesigned survey ? 
Options: a ) 2 % , b ) 4 % , c ) 14 % , d ) 28 % , e ) 63 %
Example Output:
b