For perfectly rigid bodies, the elastic constants, Y, B and n are

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answer is B.

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Detailed Solution

Concept: When a body is loaded, its behavior depends on the state, shape, and size of the object. A rigid body is an object with almost zero deformation under load.
A body that deforms under load conditions is not considered a rigid body. Depending on the load conditions, stress and strain occur in the body and Hooke's law is used to determine the relationship between stress and strain. The strain caused by the load conditions of the body can give the value of the elastic constant. Elongation here means that the shape of the body changes from its original shape due to external stress. Rigid bodies have zero deformation under load, so the strain value is zero. As a result, the strain is inversely proportional to the elastic constant, so the Young's modulus (elastic constant) is infinite.
Hence, the correct option is 2.

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