We often characterize adolescents as impulsive, reckless and emotionally unstable. We used to attribute this behavior to “raging hormones.” More recently, it’s been popular in some scientific circles to explain adolescent behavior as the result of an imbalance in the development of the brain.
According to this theory, the prefrontal cortex, the center of the brain’s cognitive-control system, matures more slowly than the limbic system, which governs desires and appetites including drives for food and sex. This creates an imbalance in the adolescent brain that leads to even more impulsive and risky behavior than seen in children — or so the theory goes.
This idea has gained currency to the point where it’s become common to refer to the “teenage brain” as the source of the injuries and other maladies that arise during adolescence.
In my view, the most striking failure of the teen brain hypothesis is its conflating of important differences between different kinds of risky behavior, only a fraction of which support the notion of the impulsive, unbridled adolescent.

What has been the common explanation for teens’ risky behavior?

A. the developmental state of their brain
C. the decrease of hormones in their body
B. their focus on rewarding activities
D. their inability to recognize risky situations