Which of the following statements about Carey's "gravity model of interaction" is accurate?
A. The predicted amount of interaction between any two places is inversely proportional to the squared distance between the two places.
B. The source of Carey's inspiration was Isaac Newton's law of universal gravitation.
C. The predicted amount of interaction between any two places is proportional to the product of their population.
D. Places with larger populations exert a greater "attraction" on one another and can be expected to interact more than those with smaller populations.
E. All of these are correct.
Answer: E
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