A sphere of diameter $6\; cm$ is dropped into a circular cylindrical vessel partly filled with water. The diameter of the vessel is $12\; cm$ . If the sphere is completely submerged in water the rise in the level of water in the vessel is ____ cm

Question

$(A) \; 1\;cm \\(B)\;0.5 \; cm \\(C)\;1.5 \;cm \\(D)\;0.15 \;cm $