(B) Poisson’s ratio of a stable, isotropic, linear elastic material lies in the range - 1 < σ < 0.5, theoretically. For most of the materials σ < 0.5. This is because, moduli of elasticity should have positive values. Negative Poisson’s ratio in DESIGNED materials and in some anisotropic materials has been observed. ∴ For most of the materials σ < 0.5. ∴ option (B) is correct.