Option (A) is correct because biodiversity is richer in tropical regions. Tropical forest ecosystems cover less than 10 percent of earth’s surface, and contain about 90% of the world’s species.

Option (B) is not correct because polar region experience ice age type events where glaciers have covered the land. This region is not rich in biodiversity because it has more ecological obstacles.

Option (C) is not correct because temperate regions are extensively altered by human activities which have dramatic impacts on biological diversity.

Option (D) is not correct because biological diversity in the world’s oceans was unclear. It is now known to play a vital role in maintaining the functionality and productivity of ecosystems.