Which Situation Best Represents the Benefits of Nonmarket Values Inherent

Which situation best represents the benefits of nonmarket values inherent in the protection of ecosystem biodiversity?

A) Setting up a program to prevent poaching and the sale of endangered coral reef fish
B) Setting up a captive breeding program to preserve endangered chimpanzees
C) Replanting to return a lawn or backyard to its natural prairie state
D) Participating in ecotourism to see an endangered species in its preserved natural habitat
E) Visiting a zoo or aquarium to see species not likely to be seen in the wild