The sum of the ages of four children Anil, Benu, Chas and Dave is $$20$$. Dave is $$5$$ years older than Chas, and $$3$$ years older than Benu. Anil is $$3$$ years younger than Chas. How old is Anil? ． 
选项为:A:$$1$$  B:$$4$$  C:$$5$$  D:$$6$$  E:$$9$$  请回答其中一个选项.