Concept:A rigid body is one that does not change its shape or size when external forces act on it.
Explanation:In a rigid body, the distance between any two particles remains constant, so it is not easily deformed.
An elastic body regains its shape after deformation, which is different from rigidity.
A plastic body remains deformed after the force is removed, so it is not rigid either.
Brittleness describes a material that breaks easily, not one that resists deformation.
Hence, the statement that best describes a rigid body is the one that says it is not easily deformed.
Answer:A. is not equally deformed (meaning it is not easily deformed by external forces).