The melting points of most of the solid substances increase with an increase of pressure acting ...

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The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because :
(A) ice is less dense than water
(B) it generates heat
(C) hydrogen bonds break under pressure
(D) none of the above.
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