Which of the following series correctly represents relations between the elements from X to Y ? $\;X \to Y\;$

(a) $\; 3_{Li} \to {19}_k\;$ Ionization enthalpy increases (b) $\; {9}_F \to {35}_Br \;$ Electron gain enthalpy with negative sign increases (c) $\; {9}_C \to {32}_Ge\;$ Atomic radii increases  (d) $\;{18}_Ar \to {54}_Xe\;$ Noble character increases