A cylindrical vessel of height $25 \;cm$ and $10\;cm$ as the radius of the base is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. The height of the conical heap is $28 \;cm$ the radius of its base is ______ cm.

Question

$(A) \;16.4\;cm \\(B)\;17.4\;cm \\(C)\;15.4\;cm \\(D)\;14.4\;cm$