Density of Delhi is  11,297 per square kilometre...And it is highest...
so the correct answer is D

The Indian State/UT with highest density of population, according to 2011 census

The correct answer is option 'D' - Delhi.

Explanation:

The density of population is calculated by dividing the total population of an area by its total land area. It is an important demographic indicator that helps us understand the concentration of people in a given area.

According to the 2011 Census of India, Delhi has the highest density of population among all the Indian states and union territories. Let's explore the reasons behind this:

1. Small Geographical Area:
- Delhi is the capital territory of India and is a small region compared to other states.
- With a total land area of approximately 1,484 square kilometers, it is one of the smallest administrative units in the country.
- Despite its small size, it has a significant population, leading to high population density.

2. Migration:
- Delhi attracts a large number of people from other parts of the country in search of better employment opportunities, education, and improved living conditions.
- This influx of migrants has contributed to the rapid growth of the population in the city.
- People from various states and regions come to Delhi, adding to its population density.

3. Economic Opportunities:
- Delhi serves as a major economic hub and offers a wide range of employment opportunities in various sectors such as finance, IT, government services, and manufacturing.
- The city's thriving economy and availability of jobs have attracted people from different parts of India, leading to an increased population density.

4. Urbanization:
- Delhi is a highly urbanized region with a well-developed infrastructure, including transportation, healthcare, education, and entertainment facilities.
- Many individuals and families move to Delhi in search of better living standards and access to urban amenities.
- This urbanization trend has contributed to the high population density in the city.

5. Government Policies:
- Delhi being the capital territory receives special attention and investment from the central government.
- The city has witnessed significant development in terms of infrastructure, which has further attracted people to settle down in Delhi.

In conclusion, Delhi has the highest population density among all the Indian states and union territories due to its small geographical area, migration, economic opportunities, urbanization, and government policies.