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If the volume of a block of metal changes by \( 0.12 \% \), when it is heated through \( 20^{\circ} \mathrm{C} \), then the coefficient
\( \mathrm{P} \) of linear expansion is

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(a) \( 4 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1} \)
(b) \( 2 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1} \)
(c) \( 0.5 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1} \)
(d) \( 4 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1} \)
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