The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Most African countries have Unitary form of government.
A unitary state is a state governed as a single power in which the central government<span> is ultimately supreme and any administrative divisions (sub-national units) exercise only powers that the central </span>government chooses to delegate. The majority of states in the world have a unitary system of government<span>.
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The answer is: adapt to one's environment.
According to piaget, organisms with low intelligence tend to only recognize low variety way of living and unable to adapt to extreme change in environment. More often than not, this would make such organisms much more likely to extinct.
Intelligent organisms on the other hand, can adapt to extreme changes and had a very high likelihood to survive to the next generation. (humans for example can live in both cold north pole and hot dessert while no other organisms able to live in two completely different climate, indicating how good we are in adapting to our environment)
