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Which one of the following has the lowes...

Which one of the following has the lowest ionization energy?

A

` 1 s^(2) 2s^(2) 2p^(6) `

B

` 1 s^(2) 2s^(2) 2p^(6) 3s^(1) `

C

` 1s^(2) 2s^(2) 2p^(5) `

D

` 1s^(2) 2s^(2) 2p^(3) `

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