With regard to the destruction of tropical forests,the focus is often on biodiversity and the impact to these ecosystems.What is a direct benefit to humans that helps explain why these forests need to be preserved?

A)This diversity could contain undocumented insect species.
B)Natural and undisturbed areas are important wildlife habitats.
C)The diversity could contain novel drugs for consumers.
D)The plant diversity provides shade, which lowers global warming.