The correct answer is option 'B', which is second.

Explanation:
India is the second most populous country in the world, with a population of over 1.3 billion people. The country's population has been growing rapidly over the years, and it is expected to surpass China as the most populous country in the near future.

Here is an explanation of why India is ranked second among the population of different countries:

Population growth:
- India's population has been growing at a significant rate due to factors such as high birth rates, declining mortality rates, and increased life expectancy.
- The country has experienced a steady increase in its population over the years, contributing to its high rank.

Factors contributing to population growth:
1. Birth rates: India has a high birth rate, which means that the number of births per 1,000 people is relatively high compared to other countries. This contributes to the population growth.
2. Declining mortality rates: The mortality rate in India has been decreasing due to improvements in healthcare, sanitation, and access to medical facilities. This has led to a higher life expectancy and a larger population.
3. Increased life expectancy: The life expectancy in India has increased over the years, primarily due to advancements in healthcare and better living conditions. This has resulted in a larger population.

Comparison with other countries:
- India's population is second only to China, which has been the most populous country for a long time.
- China's population is currently over 1.4 billion, slightly higher than India's population. However, India's population is growing at a faster rate, and it is projected to surpass China's population in the future.

Conclusion:
India is ranked second among the population of different countries because of its high population growth rate, high birth rates, declining mortality rates, and increased life expectancy. The country's population is expected to continue growing, and it is likely to become the most populous country in the world in the coming years.