Which of the following statements are correct?
$1.$ Charcoal can be obtained by heating wood in the absence of air.
$2.$ Charcoal is an impure form of graphite.
$3.$ Diamond is thermodynamically the most stable allotrope of carbon.
$4.$ Coke is used as an oxidising agent during the extraction of iron from its ores.

  • A
    $1$ and $3$
  • B
    $2$ and $4$
  • C
    $1$ and $4$
  • D
    $1$ and $2$

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