A. Emperor Alexander Severus, who was assassinated by his troops after a defeat.
B. Roman Senade, which accepted some army generals as legitimate emperors.
C. Security of the border, which they were supposed to keep. While the were fighting among themselves, they neglected the defenses of the Emprire, resulting in invasions.
D. Crisis, which ended with the Reforms made by Diocletian.
Answer:
The Hawthorne Effect
Explanation:
The Hawthorne effect (also referred to as the observer effect) explains that individuals modify an aspect of their behavior in response to their knowledge of being observed. In this study students changed their eating place during the observation period.
