Direction: The circle graph shows the difference modes of conveyance of the children of a certain school. What fraction of the children come to school by school bus?

• A.  \[1\frac{1}{2}\]                                 
• B.  \[\frac{1}{2}\]                       
• C.  \[\frac{1}{8}\]                       
• D.    \[\frac{1}{4}\]