The correct option is C 9×9!
The number is to be of 9 digits.
The first place can be filled in 9 ways only (as 0 can not be in the left most position )
Having filled up the first place the remaining 8 places can be filled in 9×8×7×...×2=9! ways
Hence, total number of 9 digit numbers with distinct digits is 9×9!