The elements which occupy the peaks of ionisation energy curve, are [CBSE 2000]

• A. \[Na,\,\,K,\,\,Rb,\,Cs\]
• B. \[Na,\,\,Mg,\,\,Cl,\,\,I\]
• C. \[Cl,\,\,Br,\,\,I,\,F\]
• D. \[He,\,\,Ne,\,\,Ar,\,\,Kr\]