It takes Suma \[\frac{1}{6}\] hour to walk to the playground and \[\frac{1}{3}\] hour to walk from the playground to school. How much time does it take Suma to walk to the playground and then to school?

• A.  \[\frac{2}{9}\] hour                          
• B.  \[\frac{1}{2}\] hour  
• C.    \[\frac{1}{3}\] hour  
• D.    \[\frac{2}{3}\] hour