B probably, I’m sure that’s the most weak one.
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Rome did not have a good system of succession. Rulers were not chosen carefully and that lead to major problems throughout Rome. Almost all rulers of Rome were murdered by either in cold blood or by poison. The next ruler had the same fate. Almost every ruler survived for no more than 2 years.
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Easy defeat of foreign invaders is obviously positive, so it couldn’t be a factor that would topple an empire. Security is good.
