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The electronic configuration of elements A, B and C are [He] $2 s^{1}$ ,[Ne] $3 s^{1}$ and [Ar] $4 s^{1}$ respectively. Which one of the following order is correct for $I E_{1} (i n k J m o l^{- 1})$ of A, B and C?

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$A > B > C$

$C > B > A$

$B > C > A$

$C > A > B$

answer is A.

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$A > B > C$

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