Arun ate \[\frac{1}{6}\] of a chocolate bar and Amir ate \[\frac{3}{6}\] of it. What fraction of the chocolate bar was eaten by the two children?

• A.  \[\frac{4}{6}\]                                  
• B.  \[\frac{2}{6}\]
• C.   \[\frac{1}{6}\]                                 
• D.   \[\frac{3}{6}\]