There are 20 books of which 4 are single volumes and the other are books of 8, 5 and 3 volumes respectively. In how many ways can all these books be arranged on a self so that volumes of the same book

• A. 7! 8! 5! 3!
• B. 7! 8! 4! 3!
• C. 7! 6! 5! 3!
• D. None of these