The Number of Vehicles Passing Through a Bank Drive -Up $\begin{array} { l l l l } 25 & 27 & 25 & 28 \end{array}$

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 15 -minute period.
$\begin{array} { l l l l } 25 & 27 & 25 & 28 \end{array}$
$\begin{array} { l l l l } 28 & 25 & 30 & 27 \end{array}$
$\begin{array} { l l l l } 35 & 31 & 31 & 29 \end{array}$
$\begin{array} { l l l l } 24 & 31 & 25 & 20 \end{array}$
$\begin{array} { l l l l } 15 & 27 & 27 & 27 \end{array}$

A) 26.85 vehicles
B) 28 vehicles
C) 27 vehicles
D) 31 vehicles