The correct answer is Option (2) - Indo-Burma Plains

'Biodiversity hotspots' are regions characterized by exceptionally high levels of species richness and a high degree of endemism, meaning that many species found in these areas are unique and not found anywhere else in the world. Initially, 25 biodiversity hotspots were identified, but over time, nine more have been added to the list, bringing the total number of biodiversity hotspots in the world to 34. These hotspots are also areas where habitat loss is occurring rapidly.

Biodiversity hotspots – Western Ghats and Sri Lanka, Indo-Burma, and the Himalayas – are located in regions of India with exceptionally rich biodiversity. Despite covering less than 2 percent of the Earth's land area, these hotspots collectively house an extremely high number of species. By implementing strict protection measures in these hotspots, it is possible to reduce the rate of ongoing mass extinctions by almost 30 percent.