The desks in a Primary $$3$$ classroom are arranged in straight rows. Each row has the same number of desks. Greggory sits at the desk that is in the fourth row from the front and back. He sits at the centre of his row and there are $$5$$ desks to his left. How many desks are in the classroom? 
选项为:A:$$63$$  B:$$99$$  C:$$77$$  D:$$81$$  E:None of the above  请回答其中一个选项.