In which of the following arrangements is the order not according to the property indicated against it?

Question

$(A) Rb < Br < F < Cl$: Increasing electron gain enthalpy

$(B) Li < Na < K < Rb$ : Increasing metallic radius

$(C) B < C < N < O$ : Increasing first ionization energy

$(D) Al^{3+} < Mg ^{2+} < Na^{+} < F$ : Increasing ionic size