A body moving in a straight line covers a distance of $14 m $ in the 5th second and 20 m in the 8th second. How much distance will it cover in the 15th second ?

Question

$\begin{array}{1 1}(A)\; zero \\ (B)\;34\;m \\ (C)\;4\;m \\(D)\;2\;m \end{array} $