A cylindrical vessel of height 30 cm and 12 cm as 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 $25\;cm$ , the radius of the base is _______ cm (approx)

Question

$(A) \; 20\;cm \\(B)\;23\;cm \\(C)\;22\;cm \\(D)\;25\;cm $