If $$6$$ students are wearing jeans, then $$18-6=12$$ are not. The ratio of students wearing jeans to students \emph{not} wearing jeans is $$6:12=1:2$$. 
In a class of $$18$$ students, $$6$$ are wearing jeans. What is the ratio of students wearing jeans to students \emph{not} wearing jeans? 
A. $$1:2$$ 
B. $$1:3$$ 
C. $$2:3$$ 
D. $$2:1$$ 