A cylindrical vessel of height $24\; cm$ and $12\; cm$ diameter 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 formed . The height of the conical heap is $24\;cm$, the radius of the base is _______ cm( approx)

Question

$(A) \; 9.4\;cm \\(B)\;11.4\;cm \\(C)\;10.4\;cm \\(D)\;12.4\;cm$