Read the informational text excerpt:
'The Great Smoky Mountains National Park, established in 1934, straddles the border between Tennessee and North Carolina. Renowned for its rich biodiversity, the park shelters over 19,000 documented species of plants, animals, and fungi. Ancient mountains, misty valleys, and dense forests make it the most visited national park in the United States.'
Which detail supports the claim that the Great Smoky Mountains National Park has exceptional biological variety?
- AThe park was officially established by Congress in 1934.
- BThe park borders both Tennessee and North Carolina.
- CThe park attracts millions of tourists every year.
- DThe park shelters over 19,000 documented species of living organisms.