The answer is powerful Chemical. Powerful chemical like
nuclear power can potentially give accidents, generation
of plutonium, limited uranium supply, cost, radioactive waste. Though
there are also advantages of using nuclear power like 1 kg of enriched nuclear
fuel produces 2 million times the energy in 1 kg of coal.
D, combination of all the them
was a period of rapid colonization of the African continent by European powers. But it wouldn't have happened except for the particular economic, social, and military evolution Europe was going through.
