$$15\text{g}$$ coffee is dissolved in $$45\text{g}$$ of milk. What are the ratio of coffee to milk and the ratio of coffee to coffee-milk, respectively? 
选项为:A:$$1:3$$, $$1:4$$  B:$$1:4$$, $$1:3$$  C:$$3:1$$, $$4:1$$  D:$$4:1$$, $$3:1$$  请回答其中一个选项.