Answer: D. The Demographic transition
Explanation: Demographic transition explains the association between population growth and economic development. It explains the high infant mortality and high birth rate associated with non-industrial, low technology and many developing countries and the low infant mortality, low birth rate commonly found in industrial, high technology and high level of education found in developed countries.
It is an historical overview which shows high birth rate in low industrial and developing countries and low birth rate in industrial and developed countries.
C : What is appropriate as determined by some standard of moral conduct.
It displays a behavior called reinforcement
The best and most correct answer among the choices provided by the question is the fourth choice which is all of the above.
The use of fossil fuels makes the US vulnerable because it is an exporter of the fuel, and also it imports its petroleum from foreign countries most especially the Middle East.
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