b
\((b)\) \((a) \) Correct order \(\to Ca^{2+} > K^+ > Cl^- > S^{2-}\) (Ionisation energy)
For isoeleetronic species \((I.E. \propto Z_{eff})\)
\((b)\) Correct order \(\to C < N < F < O\) (\(2^{nd} \,I.E.)\)
Second electron removal from oxygen requires more energy as it acquires  table \(2s^2\,2p^3\)
configuration after removal of one electron.
\((c)\) Correct order \(\to B > Tl > In > Ga > Al\) (Electronegativity)
In general \(EN\) increases in boron family from top to bottom due to increase in \(Z_{eff}\) on
valence shell while boron has highest \(E.N.\) due to its vary small size.
\((d)\) Correct order \(\to Na^+ > Li^+ > Mg^{2+} > Al^{3+} > Be^{2+}\) (Ionic  radius) 
Ionic radius depends on \(Z_{eff}\) and number of shells.