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Correct answer: C
Explanation
A is incorrect because the passage mentions internal factors but frames them alongside ecological and socio-economic issues, not solely political instability. B is incorrect because the passage explicitly rejects the idea that a single variable can account for failure. C is correct because the text states collapse was 'rarely an abrupt event but rather a protracted process of gradual systemic decay' due to 'multiple interacting weaknesses.' D is incorrect because the passage contrasts modern views with older ones that focused on singular dramatic catalysts like invasion.