Nathan has $$4$$ red shirts, $$6$$ yellow shirts and $$8$$ white shirts. What fraction of his shirts are white? Give your answer in its simplest form. 
选项为:A:$$\frac{8}{18}$$  B:$$\frac{3}{9}$$  C:$$\frac{4}{9}$$  D:$$\frac{4}{5}$$  请回答其中一个选项.