c
Considering the first four I.E values. of elements, the \(I.E._4\) value of element is high and the difference between \(I.E._3\) and \(I.E._4\) is very High.

\(I \cdot E_2-I E_1=412-284=128 \cdot kJ / mol\)

\(I \cdot E_3-I \cdot E_2=654-412=242 kJ / mol\)

\(I \cdot E_4-I \cdot E_3=3210-656=2554 kJ / mol\).

The avalue of \(2554\,kJ/mol\) is the differeace between \(I-E_4\) and \(I-E_3\) suggest that the element is not able to loose its electron After loosing the three election. i.e the element will become stable on loss of three electrons.