In the context of Indian demographics, which year is known as the 'Year of the Great Divide'?

Identify the correct statements regarding the Census of India: (a) The Census is regularly conducted every 10 years. (b) The 2011 Census was the fifteenth census of India. (c) Migration does not affect population growth rates at all. (d) Urban areas generally have a higher population density than rural areas.

Based on demographic data of India, which of the following statements are true? (a) Bihar has a high population density. (b) Arunachal Pradesh has a low population density. (c) Kerala has a low sex ratio. (d) Delhi has a high population density.