According to the census 2011, which is the least populous state in India?

Correct option is B

According to the Census of India 2011, the least populous state in India is Sikkim. As per the census, the population of Sikkim was 610,577 at that time. Almost 35% of the state is covered by Khangchendzonga National Park – a UNESCO World Heritage Site.
• Sikkim is also one of the least densely populated Indian states, with only 86 persons per square kilometre.
• The sex ratio is 889 females per 1,000 males, with a total of 321,661 males and 286,027 females recorded in 2011.