Answer:
The answer is "second choice"
Step-by-step explanation:
For a successful rule, the Empire of Rome was becoming too huge and the external regions do anything they want. They were trying to find a way to solve this and other issues. He concluded that breaking Europe into two parts would be the solution.
In this question, Whenever we see the map, it explains that perhaps the west contained a vast area but was at higher risk of foreign occupation, that's why the western half of the kingdom was difficult to control.