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'.

Ex Input:
Problem: the cost price of a radio is rs . 1500 and it was sold for rs . 1110 , find the loss % ? 
Options: a ) 18 , b ) 16 , c ) 26 , d ) 17 , e ) 11

Ex Output:
c


Ex Input:
Problem: an escalator moves towards the top level at the rate of 7 ft . sec and its length is 180 feet . if a person walks on the moving escalator at the rate of 2 feet per second towards the top level , how much time does he take to cover the entire length . 
Options: a ) 5 sec , b ) 25 sec , c ) 20 sec , d ) 15 sec , e ) 10 sec

Ex Output:
c


Ex Input:
Problem: a man gains 10 % by selling an article for a certain price . if he sells it at double the price , the percentage of profit will be . 
Options: a ) 130 % , b ) 120 % , c ) 150 % , d ) 160 % , e ) 170 %

Ex Output:

b