Concept:A body is in neutral equilibrium when a slight displacement does not raise or lower its centre of gravity.
Explanation:The cone in position Z is resting on its curved side.
When such a cone is slightly disturbed, it rolls on the horizontal surface.
During this rolling, the centre of gravity remains at the same height above the ground.
It is neither raised, as happens in stable equilibrium, nor lowered, as happens in unstable equilibrium.
Therefore, the cone in that side position satisfies the condition for neutral equilibrium.
Answer:A. Z only
