Answer:
His prefrontal cortex is underdeveloped.
Explanation:
The "prefrontal cortex" is also written as "PFC" and is defined as the "cerebral cortex" that covers the front part of a person's frontal lobe of the brain. The prefrontal cortex is being implemented or is significant in planning or developing personality expression, moderating social behavior, complex cognitive behavior, and decision-making process, etc.
A person's prefrontal cortex is being fully-developed or matured at the age of twenty-five years and therefore an adolescent has underdeveloped prefrontal cortex.
As per the question, Xavier's poor decision making is due to the fact that his prefrontal cortex is underdeveloped.
