The roof of a building which in the form of a rectangle has dimensions $22\;m \times 20\;m$ drains the rain water into cylindrical vessels having diameter of base $2\;m$ and height $3.5\;m.$ If the rain water collected from the roof just fills the cylindrical vessel, then the rainfall in $cm$ is

Question

$\begin{array}{1 1} (a)\; 1.5 \;cm \\ (b)\; 2\;cm \\ (c)\; 2.5\;cm \\ (d)\; 3 \;cm \end{array}$