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For an isotropic material, the shear modulus G is related to E and ν by:

AG = E·(1-2ν)
BG = E
CG = E/(2(1+ν))
DG = E·ν
Answer & Solution
Correct answer: C. G = E/(2(1+ν))
**Classical relation:** $G = \frac{E}{2(1+\nu)}$. Combined with $K = \frac{E}{3(1-2\nu)}$, the four constants (E, ν, G, K) are linked by two equations — only 2 independent.
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