(A) South Asia
(B) America
(C) Europe
(D) None of these
🧠 Explanation:
- South Asia is home to densely populated countries like India, Pakistan, and Bangladesh.
- This region collectively hosts over 1.8 billion people.
- High birth rates and urbanization contribute to population density.
- It includes some of the world's largest cities like Delhi, Karachi, and Dhaka.