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: company p had 15 percent more employees in december than it had in january . if company p had 480 employees in december , how many employees did it have in january ? 
Options: a ) 391 , b ) 417 , c ) 410 , d ) 423 , e ) 445
Example Output: b

Example Input: Problem: a number increased by 20 % gives 480 . the number is ? 
Options: a ) 200 , b ) 300 , c ) 400 , d ) 500 , e ) 600
Example Output: c

Example Input: Problem: a man can row his boat with the stream at 20 km / h and against the stream in 4 km / h . the man ' s rate is ? 
Options: a ) 1 kmph , b ) 7 kmph , c ) 98 kmph , d ) 6 kmph , e ) 8 kmph
Example Output:
e