The Lee-Jones Oscillation (demographic transition) concept describes a situation in a country where death rates fall first before birth rates fall. In Stage 3 of demographic transition, the key characteristic is:

• A High birth rates and high death rates with near-zero growth
• B High birth rates and declining death rates with maximal population growth
• C Very low birth rates and very low death rates with near-zero growth
• D Declining birth rates with already low death rates and decreasing growth ✓

Explanation

In the demographic transition model: Stage 1 = high births + high deaths (pre-industrial, near zero growth); Stage 2 = high births + rapidly falling deaths (early industrial, maximum growth); Stage 3 = declining births + already low deaths (late industrial, slowing growth) — this is the stage where contraception, female education, and urbanization drive fertility decline; Stage 4 = low births + low deaths (post-industrial, near zero growth or decline). India is currently in Stage 3, with TFR falling but still above replacement in some states. Stage 5 (sub-replacement fertility) is seen in Japan and parts of Europe.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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