Task: Question Answering
Input (English): Problem: a and b undertake to do a piece of work for rs . 1200 . a alone can do it in 6 days while b alone can do it in 8 days . with the help of c , they finish it in 3 days . find the share of a . 
Options: a ) 500 , b ) 600 , c ) 750 , d ) 800 , e ) none of them
Output (English): b