The question asks us to identify the state with the lowest population density based on the data from the 2011 Census. The correct answer is option 4, Mizoram.

To understand why Mizoram has the lowest population density, let`s analyze each option:

1) Sikkim: Sikkim is a small state located in the northeastern part of India. Though it is relatively small in size, it has a significant population, resulting in a higher population density compared to other states. Therefore, option 1 is not the correct answer.

2) Nagaland: Nagaland is another state in northeastern India. Similar to Sikkim, it has a relatively higher population density due to its size and population. Hence, option 2 is not the correct answer.

3) Manipur: Manipur is also a northeastern state with a higher population density due to its size and population. Consequently, option 3 is not the correct answer.

4) Mizoram: Mizoram is a small state in northeast India with a lower population compared to other states. Since its geographical area is larger compared to its population, it has the lowest population density among the given options. Therefore, option 4 is the correct answer.

In conclusion, Mizoram has the lowest population density among the