Which of the following is the underling principle in the adoption of biological control of pests?

The underlying principle in the adoption of biological control of pests is the predator-prey relationship in the ecological community. Biological control involves the use of living organisms, such as predators or parasites, to control pests and reduce their damage to crops. This method is based on the understanding that there is a natural balance in ecosystems, and that predators can keep the population of pests in check. By introducing natural enemies of pests, such as predators or parasites, the natural balance is restored, and the need for chemical pesticides is reduced. Therefore, the predator-prey relationship is the key principle behind the adoption of biological control of pests.