CORRECT answer is option 2, i.e 3 – 2 – 1 - 4.Population SIZE as per the census 2011Uttar PRADESH is the most populous state in the country.Sikkim is the least populous state in the country.Delhi is the most populous Union Territory in the country.Lakshadeep is the least populous Union Territory in the country.The list of top 10 populous states as per the census 2011 are as follow.Rank State Population (2011 Census)1Uttar Pradesh19,95,81,4772Maharashtra11,23,72,9723Bihar10,38,04,6374West Bengal9,13,47,7365Andhra Pradesh8,46,65,5336Madhya Pradesh7,25,97,5657Tamil Nadu7,21,38,9588Rajasthan6,86,21,0129Karnataka6,11,30,70410Gujarat6,03,83,628