The correct answer is Ravenna.
That is because Ravenna was a city that was reconquered by the Byzantine empire after it originally fell to the Ostrogoth when the fall of the Western Roman Empire occurred. It was a capital for western Romans and for the Ostrogoth, but it wasn't for the Byzantine people who had their own capitol even after they reconquered it.
The correct answer is B) the lack of availability or lack of use of contraceptives.
<em>The world’s population is concentrated in certain countries like China most likely because of the lack of availability or lack of use of contraceptives.
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There are many countries, most of the underdeveloped countries, that lack of a sexual education program in school. The government also does not have sexual education campaigns for families and many people do not use a contraceptive or condom to control natality. That is why certain countries have overpopulation in their territories. That is the case of China or India.