Final answer:
The parts of the brain that underlie rational decision making and impulse control mature during adolescence as the prefrontal cortex develops.
Step-by-step explanation:
The parts of the brain that underlie rational decision making and impulse control mature during adolescence. Specifically, these skills develop as the prefrontal cortex (PFC), which is involved in functions such as decision making, information processing, problem-solving, and impulse control, continues to develop throughout adolescence.