There are $$3$$ red balls, $$5$$ blue balls and $$2$$ yellow balls of the same size in an opaque bag. Amy takes one randomly from the bag. The probability of choosing a red ball is~\uline{~~~~~~~~~~}~. 
选项为:A:$\frac1{12}$  B:$\frac1{2}$  C:$\frac1{5}$  D:$\frac3{10}$  E:$\frac1{6}$  请回答其中一个选项.