In which of the following options order of arrangement does not agree with the variation of property indicated against it?
(a) Al³⁺ < Mg²⁺ < Na⁺ < F^– (increasing ionic size)
(b) B < C < N < O (increasing first ionization enthalpy)
(c) I < Br < Cl < F (increasing electron gain enthalpy)
(d) Li < Na < K < Rb (increasing metallic radius)

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