Which of the following fractions are in order from the least to the greatest?

• A.   \[\frac{1}{2},\frac{2}{3},\frac{2}{6}\]             
• B.  \[\frac{1}{2},\frac{2}{6},\frac{2}{3}\]  
• C.         \[\frac{2}{6},\frac{2}{3},\frac{1}{2}\]              
• D.         \[\frac{2}{6},\frac{1}{2},\frac{2}{3}\]