Choose the correct answer in a cylindrical tank of radius 10 m is being filled with wheat at the rate of 314 cubic metre per hour. Then the depth of the wheat is increasing at the rate of

Question

$$\begin{array}{1 1}(A)\; 1 m^3/h & (B)\; 0.1 m^3/h \\(C)\; 1.1 m^3/h & (D)\; 0.5 m^3/h \end{array}$$