The length of the minute hand of a clock is $21\;cm.$ What will be the area swept by the minute hand in 5 minutes ?

Question

$\begin{array}{1 1} (a)\; 115.5\;cm^2 \\ (b)\; 120\;cm^2 \\ (c)\; 120.5 \;cm^2 \\ (d)\; 121 \;cm^2 \end{array}$