Task: Question Answering
Input (English): Problem: there are 9 cities numbered 1 to 9 . from how many cities the flight can start so as to reach the city 8 either directly or indirectly such that the path formed is divisible by 3 . 
Options: a ) 7 , b ) 8 , c ) 9 , d ) 10 , e ) 11
Output (English): b