The correct order of acid strength of the following substituted phenols in water at $28^{\circ} C$ is:

• A
  $p$-nitrophenol $ < $ $p$-fluorophenol $ < $ $p$-chlorophenol
• B
  $p$-chlorophenol $ < $ $p$-fluorophenol $ < $ $p$-nitrophenol
• C
  $p$-fluorophenol $ < $ $p$-chlorophenol $ < $ $p$-nitrophenol
• D
  $p$-fluorophenol $ < $ $p$-nitrophenol $ < $ $p$-chlorophenol