I think its A. I'm not entirely sure but it does seem most logical.
Anyways a big reason that these powers are limited is to keep society in a stable place. Tyranny brought onto any civilization over the years has led to its downfall. This balance helps keep both the government and its people under equal terms.
Its not B. because this would allow tyrant rulers to keep their position putting everyone else at a disadvantage to please themselves. This simply doesn't make sense if you were to limit the government.
C. isn't a possibility either because each government only governs over said region.
D. can also be justified under my response to B. since it has the same meaning yet is worded differently/ or relates to more modern leaders I suppose.
Anyways, I hope I was helpful and good luck :D
