The correct answer is A, B & C. Key Points A biodiversity hotspot is a biogeographic region with significant levels of biodiversity that is threatened by human habitation. Biodiversity hotspots host their diverse ecosystems on just 2.4% of the planet's surface. However, the area defined as hotspots covers a much larger proportion of the land. They have a high concentration of endemic species. The Western Ghats in India is a biodiversity hotspot.​ Many areas within the tropical zones are considered biodiversity hotspots and are home to the world's most rare and endangered species. Hence,option 3 is correct. Additional Information The Western Ghats is one of the world's biodiversity hotspots with over 5,000 flowering plants, 139 mammals, 508 birds, and 179 amphibian species. At least 325 globally threatened species occur here The range covers 60,000km2 and forms the catchment area for a complex of river systems that drain almost 40% of India. India has some of the world's most biodiverse regions. It hosts 4 biodiversity hotspots: The Himalayas, the Western Ghats, the Indo-Burma region, and the Sundaland These hotspots have numerous endemic species. A biodiversity hotspot is a biogeographic region with significant levels of biodiversity that is threatened by human habitation. Some of these hotspots support up to 15,000 endemic plant species and some have lost up to 95% of their natural habitat.