Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

• A

  is an allotropic form of carbon
• B

  is a non-crystalline substance
• Correct answer
  C

  has carbon atoms arranged in large plates of rings of strongly bond carbon atoms with weak interplate bonds
• D

  has molecules of variable molecular masses like polymers

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