In which of the following arrangements,the sequence does not strictly follow the property indicated against it?

• A
  $Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$ : Increasing ionic size
• B
  $B < C < N < O$ : Increasing first ionization enthalpy
• C
  $I < Br < F < Cl$ : Increasing electron gain enthalpy (without negative sign)
• D
  $Li < Na < K < Rb$ : Increasing metallic radius