Save the rhinos achieve3000

What is A central idea of page 2 of the article
A- poaching can actually increase the population of certain species of plants or animals by reducing the number of invasive species in an area
B-it is often difficult to require people to comply with the national laws or treaties that forbid the international trade of plants and animals
C-people who live in areas where it is difficult to make a living should be able to engage in the illegal trade of endangered animals and their parts
D-The illegal harvesting of plants and animals can ensure the survival of other species are in danger of becoming extinct