There are two positive integers, $$x$$ and $$y$$. $$x$$ equals to $$3^{2}$$, and $$y$$ is the base of $$5^{3}$$. What is the product of $$x$$ and $$y$$? 
选项为:A:$15$  B:$45$  C:$90$  D:$1125$  请回答其中一个选项.