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: at a particular graduation party with 300 guests , 70 % of the guests brought gifts , and 40 % of the female guests brought gifts . if 30 males did not bring gifts to the party , how many females did bring gifts ? 
Options: a ) 18 , b ) 28 , c ) 40 , d ) 68 , e ) 70
Example Output: c

Example Input: Problem: a person buys an article at rs . 400 . at what price should he sell the article so as to make a profit of 40 % ? 
Options: a ) 600 , b ) 277 , c ) 560 , d ) 261 , e ) 281
Example Output: c

Example Input: Problem: a man buys an item at rs . 1300 and sells it at the loss of 20 percent . then what is the selling price of that item 
Options: a ) rs . 660 , b ) rs . 760 , c ) rs . 860 , d ) rs . 1040 , e ) none of these
Example Output:
d