There are $20$ balls of the same size in a box.  Lucas says: "Half of them are red."  Peter says: "The number of red balls is $5$ times that of green balls."  Claire says: "There are three colors of balls in the box: red, light blue, and green."  How many dark blue balls are there in the box? 
选项为:A:$$0$$  B:$$2$$  C:$$6$$  D:$$8$$  E:$$10$$  请回答其中一个选项.