There are three boxes labeled $$A$$, $$B$$, and $$C$$. Box $$A$$ contains $$1$$ red ball and $$4$$ white balls. Box $$B$$ contains $$2$$ red balls and $$3$$ white balls. Box $$C$$ contains $$3$$ red balls. All the balls are the same except for the color. Oscar randomly selects one box and then randomly selects one ball from the selected box. What is the probability that he selects a red ball? 
选项为:A:$$\frac{6}{13}$$  B:$$\frac{2}{5}$$  C:$$\frac{8}{13}$$  D:$$\frac{8}{15}$$  E:$$\frac{11}{15}$$  请回答其中一个选项.