Correct Option (D)
Statements 2 and 4 are the most logical and rational conclusions that can be drawn from the graph, considering 1970 as the base year.
- Statement 2: The graph illustrates that the population growth rate achieved a stable trajectory after 35 years from the base year (1970). This indicates that the rate at which the population was increasing became consistent or reached a plateau.
- Statement 4: Concurrently, the birth rate is observed to have stabilized after 35 years. This implies that the number of births per thousand individuals reached a consistent level, no longer exhibiting significant fluctuations or sustained trends of increase or decrease.
Incorrect Options:
- Statement 1: Population has stabilized after 35 years. This statement is incorrect. While the population growth rate may have stabilized, it does not necessarily mean that the population itself has stabilized (i.e., ceased to grow). If the stable growth rate is positive, the population would continue to increase, albeit at a constant pace, rather than becoming static.
- Statement 3: Death rate has fallen by 10% in the first 10 years. This statement cannot be definitively concluded from the information provided in the original solution, which specifically validates only the stabilization of the population growth rate and birth rate after 35 years. Without explicit data points or trends for the death rate over the initial 10-year period, this assertion remains unsubstantiated based on the given context.