Explanation:

- Option 1: Year of great divide

Refers to a demographic transition or shift. In India's context, the year 1921 is considered the year of the great divide when the death rate began to decline, leading to a population growth.

- Option 2: Census year

Correct Answer

1881 was the first nationwide census conducted in India. It marked the beginning of systematic population data collection.

- Option 3: Development Year

This term is not specifically tied to 1881. It usually relates to significant economic or infrastructure advancements within a country.

- Option 4: Revolution Year

Generally refers to years associated with major political upheaval or societal changes. 1881 in India doesn't prominently fit this description.