Which one of the following practices is most clearly an application of Frederic Clements' equilibrium model of ecology? A. introducing a species into an environment to which it is not help control the spread of another species that no longer has any natural predators B. developing incentives for industries to take corrective measures to protect the environment C. using scientific methods to increase the stability of plants and animals in areas where species are in danger of becoming extinct D. using technology to develop plant and animal resources but balancing that development with stringent restrictions on technology E. setting areas of land aside to be maintained as wilderness from which the use of extraction of natural resources is prohibited