Answer:
D
Step-by-step explanation:
Boy D shows the most "complex" personality. Every other person seems to react and do the same things.
A is not correct because the man is mainly nervous, and it doesn't show any other personality trait in the sentence, just he is nervous mainly.
B is not correct because the girl always reacts the same way. Nothing complex, and always does the same thing in every situation.
C is not correct because the woman does the same thing over and over again, just like girl B. Same characteristic does not make you complex.
Therefor, it has to be D.