Consider the following statements:
1. The rate of population growth is increasing in the country.
2. The death rate is declining faster in the country compared to birth rate.
3. The birth rate is declining faster in the country compared to death rate.
Rural-urban migration is taking place regularly in the country.
Which one of the following conclusions may be true in the light of the above facts?

The correct option is: The rate of population growth is increasing due to faster decline in death rate than in birth rate.

To understand why this conclusion is correct, we can analyze the given statements step-by-step:

1. Understanding Population Growth Rate
The population growth rate of a country is primarily driven by its natural increase rate, which is the difference between the birth rate and the death rate. Mathematically, it can be represented as:

$$\mathrm{Growth\; Rate}=\mathrm{Birth\; Rate}-\mathrm{Death\; Rate}$$

Internal migration (rural-to-urban migration) redistributes the population within the country but does not alter the overall national population size. Thus, rural-urban migration does not cause the national population growth rate to increase.

2. Analyzing the Declining Rates
For the national population growth rate to increase while both birth and death rates are declining, the gap between the birth rate and the death rate must widen over time. Let us evaluate the two scenarios:
• If the birth rate were declining faster than the death rate, the gap between them would shrink, leading to a decrease in the growth rate.
• If the death rate is declining faster than the birth rate, the gap between them widens because the number of deaths is falling much more rapidly than the number of births. This results in a net increase in the growth rate.

3. Conclusion
Since Statement 1 states that the rate of population growth is increasing, this can only be true if the death rate is declining faster than the birth rate. Thus, the correct conclusion is that the rate of population growth is increasing due to a faster decline in the death rate than in the birth rate.