What behavioral change is likely in someone using PCP?

The correct answer highlights the profound effects that PCP (phencyclidine) can have on an individual’s behavior. PCP is known for its dissociative properties and can lead to significant and unpredictable changes in a person's emotional and physical state. Extreme agitation is a common behavioral change noted in users, as PCP can cause individuals to become highly excitable or aggressive, often leading to erratic and violent behavior.

Users may also exhibit symptoms such as disorientation or a sense of detachment from their surroundings, which can further contribute to agitation. This heightened state of arousal and emotional instability can make individuals less able to control their impulses or reactions, resulting in behaviors that are not typical for them when sober.

In contrast, the other choices present behavioral changes that are typically not associated with PCP use. Cooperative interaction or improved social interactions would be unlikely as PCP can alienate users from others, while reduced anxiety is generally not characteristic, given that the drug often induces a range of intense psychological responses, including anxiety and paranoia.