There are five features of the emerging adulthood:
-the age of identity explorations;
-the age of instability;
-the self-focused age;
-the age of feeling in-between; and
-the age of possibilities.
Berta is clearly experiencing the instability one given that she can't enjoy neither her life at home nor her worklife. She is going through the instability which, in turn, will bring the self-focused one where she will find herself and what does she want.
Neither and nor are used together. Either and or are used together. B uses neither and or together, so that is wrong. C uses either and nor together, so C is wrong. D uses neither and or together, so D is wrong. That leaves A. A used neither and nor together, which is correct. So the answer is A.