Bowen has $$40$$ ounces of a $$25\textbackslash\%$$ sugar solution. After~\uline{~~~~~~~~~~}~of water evaporates, the percent concentration of the solution is $$40\textbackslash\%$$. (Evaporate: the water turns from liquid into vapor and is no longer in the solution anymore.) 
选项为:A:$$15$$ ounces  B:$$12$$ ounces  C:$$9$$ ounces  D:$$6$$ ounces  请回答其中一个选项.