Final answer:
The individual exhibiting behavior attributed to a dysregulation of serotonin in the brain is the Aggressive and impulsive individual (option B).
Step-by-step explanation:
The individual who is exhibiting behavior that could most likely be attributed to a dysregulation of the hormone serotonin in the brain is the Aggressive and impulsive individual (option B).
Serotonin is a neurotransmitter that plays a key role in regulating mood, aggression, and impulsivity. Dysregulation of serotonin levels in the brain can lead to increased aggression, impulsivity, and difficulty in controlling emotions.
For example, research has shown that individuals with lower levels of serotonin tend to exhibit more aggressive and impulsive behaviors, while individuals with higher levels of serotonin tend to be calmer and more composed.