Identify the relation between each of the given pair on either side of: : and find the missing figure/term. \[\frac{1}{2}:\frac{2}{4}::\frac{2}{3}:?\]

• A.   \[\frac{4}{8}\]         
• B.   \[\frac{4}{6}\]  
• C.   \[\frac{4}{7}\]         
• D.   \[\frac{3}{6}\]