A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called

ANS:B - compour pendulum

When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as a simple pendulum.

Compound pendulum:

Any swinging rigid body free to rotate about a fixed horizontal axis is called a compound pendulum or physical pendulum. A compound pendulum has the same period as a simple gravity pendulum of length.