For the second period elements the correct increasing order of first ionisation enthalpy is:

1. A. Li < Be < B < C < O < N < F < Ne
2. B. Li < Be < B < C < N < O < F < Ne
3. C. Li < B < Be < C < O < N < F < Ne
4. D. Li < B < Be < C < N < O < F < Ne

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