Explanation:

As per the geographical area, Rajasthan is the largest state in India, covering an area of approximately $342,239 \text{ km}^2$. Option A, Uttar Pradesh, is the most populous state but ranks fourth in area with about $240,928 \text{ km}^2$. Option B, Madhya Pradesh, is the second-largest state by area, covering around $308,252 \text{ km}^2$. Option C, Maharashtra, is the third-largest state by area, with approximately $307,713 \text{ km}^2$. Therefore, Rajasthan is unequivocally the correct answer based on land area.