लोकसंख्येचा संक्रमण सिद्धांत खालीलपैकी कोणत्या घटकांवर प्रकाश टाकतो ?
(a) जन्म दर
(b) मृत्यू दर
(c) लोकसंख्या वृद्धीदर
(d) अर्भक मृत्यू दर
योग्य पर्याय निवडा :

The correct answer is Option C ((a), (b) and (c)).

Key Points:
• The Theory of Demographic Transition was formulated by Warren Thompson (1929) and later structured by Frank Notestein (1945).
• Core Dynamic Model: The theory delineates how societies transition through phases of economic modernization via interaction among three primary variables:
• Birth Rate (a): Declines as industrialization, urbanization, and literacy rise.
• Death Rate (b): Plummets early due to improvements in public health, sanitization, and nutrition.
• Population Growth Rate (c): The net differential between crude birth rate and death rate (r = CBR - CDR).
• The Stages:
• **1. *Stage 1*: High birth rate, high death rate → low, stagnant growth.
• 2. *Stage 2*: High birth rate, falling death rate → population explosion.
• 3. *Stage 3*: Falling birth rate, low death rate → slowing growth rate.
• 4. *Stage 4*: Low birth rate, low death rate → stationary, low growth.
• Infant mortality rate (d), while related, is not one of the model's core aggregate axis variables.
• Key Takeaway**: Demographic Transition Theory models population evolution via birth rate, death rate, and net population growth rate.