Ortho-nitrophenol is less soluble in water than $p-$ and $m-$nitrophenol because...

• A
  $o-$nitrophenol has a lower melting point than $m-$ and $p-$isomers.
• B
  $o-$nitrophenol is more steam volatile than $m-$ and $p-$isomers.
• C
  $o-$nitrophenol shows intermolecular $H-$bonding.
• D
  $o-$nitrophenol shows intramolecular $H-$bonding.