A top hat contains $$3$$ red chips and $$2$$ green chips. Chips are drawn randomly, one at a time without replacement, until all $$3$$ of the reds are drawn or until both green chips are drawn. What is the probability that the $$3$$ reds are drawn? (2016 AMC 8 Problems, Question \#21) 
选项为:A:$$\frac{3}{10}$$  B:$$\frac{2}{5}$$  C:$$\frac{1}{2}$$  D:$$\frac{3}{5}$$  E:$$\frac{7}{10}$$  请回答其中一个选项.