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A. Remains high and unchanged - famine, disease, and lack of medical knowledge
B. Greatly decreasing - societal ills beginning to be rectified
C. Slowly decreasing/ unchanged - societal issues continue to be addressed
D. Remains low and unchanged - food is abundant, medicos knowledge advanced and water purified.

1. Stage 4
2. Stage 2
3. Stage 1
4. Stage 3

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