Explanation:

Based on the 2011 Census of India, the four most populous states are: Uttar Pradesh (approx. $199.8$ million), Maharashtra (approx. $112.3$ million), Bihar (approx. $104.1$ million), and West Bengal (approx. $91.3$ million). Option A accurately lists these four states in descending order of population. Option B incorrectly includes Rajasthan and Gujarat, which are not among the top four. Option C incorrectly includes Andhra Pradesh and Tamil Nadu, which are also not in the top four. Option D incorrectly includes Karnataka, Madhya Pradesh, and Tamil Nadu, none of which are among the top four most populous states.