In which of the following process , Enthalpy change cannot be called as Enthalpy of atomization

• A

  $\mathrm{Na}\left(\mathrm{s}\right) \to \mathrm{Na}\left(\mathrm{g}\right)$

• B

  ${\mathrm{H}}_2\left(\mathrm{g}\right) \to 2\mathrm{H}\left(\mathrm{g}\right)$

• C

  ${\mathrm{I}}_2\left(\mathrm{s}\right) \to {\mathrm{I}}_2\left(\mathrm{g}\right)$

• D

  Both 1 and 3