\begin{array}{|l|l|l|l|l|l|} \hline \text { Interval } & 10-12 & 132 dg ^{-12} & 16-18 & 19-20 & 21-23 \\ \hline \text { years } & & & & & \\ \hline \text { No. of } & 6 & 14 & 15 & 10 & 5 \\ \hline \text { pupils } & & & & \\ \hline \end{array} The table above shows the frequency distribution of the ages (years) of pupils in a certain Sunday School. What percentage of the total number of pupils is over 15 years but less than 21 years?
A. \(60 \%\) B. \(50 \%\) C. \(45 \%\) D. \(35 \%\)
