Find the Median $\begin{array}{llll}21 & 23 & 21 & 24\end{array}$ $\begin{array}{llll}24 & 21 & 26 & 23\end{array}$

Find the median.
-The number of vehicles passing through a bank drive-up line during each 15-minute period was recorded. The results are shown below. Find the median number of vehicles going through the line in a fifteen-minute period.
$\begin{array}{llll}21 & 23 & 21 & 24\end{array}$
$\begin{array}{llll}24 & 21 & 26 & 23\end{array}$
$\begin{array}{llll}31 & 27 & 27 & 25\end{array}$
$\begin{array}{llll}20 & 27 & 21 & 16\end{array}$
$\begin{array}{lll}11 \quad 23 & 23 & 23\end{array}$

A) 22.85
B) 24
C) 27
D) 23