Detailed Solution:
The correct answer is “II Only”.
1) According to Census 2011, Bihar remains India's most densely inhabited state, whereas Delhi is the densely populated Union Territory.
2) Arunachal Pradesh is the least densely populated state in India, with a population density of 17 people per square km.
3) Uttar Pradesh's decadal population growth rate between 2001 and 2011 was 20.23%.