I'm pretty sure the answer is fingerprint scanning.
I believe the answer is: <span> it is a strong predictor of later aggression in adolescence and adulthood
Children who display constant physical aggression toward others generally experience some sort of problem in their home (they are either being ignored by their parents or they witness their parents do it and imitate them).
If this left unhandled, the aggression would become a habit as they grow up and make it much harder to be changed.</span>
I believe this is D! Hope it helps you in any way.
People can make their own lawful decisions.
