Concept:Wildlife conservation focuses on protecting wild animals and their habitats from human threats.Explanation:Cover crops, crop rotation, and mulching are all agricultural practices used to conserve soil.They do not directly protect wild animals or their natural environments.Poaching is the illegal hunting or killing of wild animals.Discouraging poaching directly reduces harm to wildlife and supports species survival.Therefore, it is a recognised wildlife conservation method.Answer:D. discouraging poaching