Which of the following statements is $NOT$ true about polymorphism?

  • A
    $NaF$ and $MgO$ are polymorphous compounds.
  • B
    Fullerene is a polymorphic form of carbon.
  • C
    Polymorphism occurring in elements is called allotropy.
  • D
    $A$ single substance that exists in two or more forms is said to be polymorphous.

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