The melting point of solid substances is directly proportional to pressure acting on them. However, ice-melts at a temperature lower than its usual melting point, when the pressure increases. This is because

• A

  ice is not a true solid
• B

  the bonds break under pressure
• Correct answer
  C

  ice is loss denser than water
• D

  pressure generates heat

Hence, the correct answer is option: 'C'.