Task: Question Answering
Input (English): Problem: a contractor undertook to do a piece of work in 18 days . he employed certain number of laboures but 9 of them were absent from the very first day and the rest could finish the work in only 6 days . find the number of men originally employed ? 
Options: a ) 3.5 , b ) 4 , c ) 4.5 , d ) 4.2 , e ) 4.3
Output (English): c