The correct answer is option 2, which states that a large section of the population in India is in the age group of 0-14 years.
The dependency ratio is a measure of the number of dependents (people who are not economically active) relative to the working-age population. Therefore, a high dependency ratio indicates a higher burden on the working-age population to support dependents.
In the case of India, having a large section of the population in the age group of 0-14 years increases the dependency ratio. This is because children below the age of 15 are generally not part of the workforce and are dependent on others, typically their parents or caregivers, for their basic needs.
Option 1, which suggests a high rate of population growth, could also contribute to a high dependency ratio. However, it is not the main reason stated in the question. Option 3, which mentions a high percentage of the population in the age group of 15-59 years, and option 4, which cites a low pace of human resource development, are not directly related to the dependency ratio.
Overall, the main reason for India having a high dependency ratio is the large section of the population in the age group of 0-14 years.