Paul witnessed a murder while walking through the subway three weeks ago. Three days after witnessing the murder, Paul began experiencing intense anxiety and reliving what he saw at night in his dreams. Paul would most likely be diagnosed with .

an acute stress disorder.

Explanation:

In abnormal psychology, an acute stress disorder is distinguished as a condition in which a person develops dissociation, severe anxiety, and a few other symptoms that tend to occur within a single month after he or she is being exposed to an extreme "traumatic stressor", for example, serious accident, witnessing the death of loved one, divorce, etc.

As per the question, Paul would most likely be diagnosed with an acute stress disorder.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

answer; the federal reserve system;