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An external pressure P is applied on a cube at $0^{\circ}C$ so that it is equally compressed from all sides. $K$ is the bulk modulus of the material of the cube and $\alpha$ is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by :

( A ) $\frac{P}{ \alpha K}$
( B ) $3 PK \alpha$
( C ) $\frac{P}{3 \alpha K}$
( D ) $\frac{3 \alpha}{ P K}$

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