The correct option is D a—25, b—9, c—34
Biodiversity hotspots are regions on Earth with a high density of biodiversity especially containing species that are endemic to that region. These hotspots are threatened by human habitations. Hotspots are irreplaceable as they are the richest source for vulnerable species. These hotspots make 2.3% of Earth’s land surface and they are not protected legally.
Initially, 25 biodiversity hotspots were identified but subsequently, 9 more have been added to the list, bringing the total number of biodiversity hotspots in the world to 34.