$A$ crystal has a coefficient of linear expansion $13 \times 10^{-7} \ K^{-1}$ in one direction and $231 \times 10^{-7} \ K^{-1}$ in every direction at right angles to it. Then the cubical coefficient of expansion is:
- A$475 \times 10^{-7} \ K^{-1}$
- B$244 \times 10^{-7} \ K^{-1}$
- C$462 \times 10^{-7} \ K^{-1}$
- D$257 \times 10^{-7} \ K^{-1}$
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