James has $600$ g of a $$8\textbackslash\%$$ salt solution, and then $120$ g of water evaporates. Find the percent concentration of salt solution at this time. 
选项为:A:$10\textbackslash\%$  B:$12\textbackslash\%$  C:$15\textbackslash\%$  D:$18\textbackslash\%$  请回答其中一个选项.