Explanation
The correct answer is (A) Indo-Myanmar Region.
The Indo-Myanmar Region, also known as the Himalaya Region, is considered the biggest biodiversity hotspot in the world. It encompasses parts of India, Nepal, Bhutan, Bangladesh, and Myanmar (formerly known as Burma). This region is known for its incredible biological diversity, including a wide variety of plant and animal species found nowhere else on Earth. The Indo-Myanmar Region is of great conservation importance and is recognized for its high levels of species endemism and habitat loss.