The demographic transition model describes population change over time. - Stage 1: High birth rate, high death rate. - Stage 2: High birth rate, falling death rate (leading to rapid population growth). - Stage 3: Falling birth rate, low death rate (population growth slows down). - Stage 4: Low birth rate, low death rate (population stabilizes or declines). In India, death rates declined significantly due to improved healthcare and living conditions, starting earlier than birth rates. By 2011, death rates were relatively low, while birth rates were still considerably above replacement level, resulting in a large natural increase and rapid population growth, characteristic of Stage 2 or the transition phase into Stage 3 where birth rates begin to fall more significantly. Option B, "High birth rate and low death rate," accurately reflects the state that generates rapid growth observed in India.