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Correct answer: B
Explanation
B is correct because the passage explicitly moves from 'singular, dramatic catastrophes' to 'protracted process of compounding crises.' A is incorrect because the shift was broader than just invasions versus governance. C is incorrect because the passage mentions climate stress but frames it as one factor among many, not the sole determinant. D is incorrect because the passage emphasizes the *interplay* between strain and environment, not that economic factors are always superior.