Select among the following groups of states of India in descending order having high concentration of population distribution according to Census 2011 data:

Correct option is A

As per the Census 2011 data, the four most populous states in descending order are:

1. Uttar Pradesh (UP) - 199.8 million 

   • India's most populous state.
   • High birth rate and dense population in Indo-Gangetic plains.

2. Maharashtra - 112.4 million 

   • Second most populous state.
   • Economic hub, with major urban centers like Mumbai and Pune.

3. Bihar - 104.1 million 

   • Third most populous state.
   • High fertility rate, rural-based economy.

4. West Bengal - 91.3 million 

   • Fourth most populous state.
   • High urban population in Kolkata and surrounding districts.