Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital In light of the above statements, choose the most appropriate answer from the options given below:

1. A. Both A and R are correct and R is the correct explanation of A
2. B. Both A and R are correct and R is NOT the correct explanation of A
3. C. A is correct but R is not correct.
4. D. A is not correct but R is correct

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