Statement-1 : During transverse oscillations of a rod, the stress introduced is shear stress. Statement-2 : Shear stress occurs when the forces tend to change the shape of an elastic body.

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Shear stress is the stress that arises when forces tend to change the shape of the body, so Statement-2 is true.

In the transverse-shear model of the oscillating rod, the layers slide over each other and the shape changes, so the stress is shear stress and Statement-1 is true.

Statement-2 explains why this stress is called shear stress, so the answer is D.

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