The primary purpose of the passage is

(a) describe some procedures used for wildlife management and consider some problems associated with the execution of those procedures
(b) outline a problem related to a wildlife management procedure and offer potential explanations for the results of an experiment bearing on that problem
(c) present experimental results that illustrate the need for certain wildlife management procedures and point out some inconsistencies in those results
(d) argue that a certain procedure used for wildlife management should be modified because of its unintended consequences
(e) propose that further experiments be performed to assess the long-term effects of certain wildlife management procedures