Which of the following methods is an example of a biological control?

The introduction of natural predators is an example of biological control because it involves utilizing living organisms to manage pest populations. This method aims to restore ecological balance by encouraging the presence of natural enemies of pests, such as specific insects, birds, or other animals that can reduce pest numbers in a sustainable manner.

This approach is advantageous because it targets the pest species specifically, minimizes harm to non-target organisms, and can lead to long-term pest suppression without the disadvantages associated with chemical controls, such as the development of resistance or harmful environmental impacts.

While other methods, such as using traps, applying synthetic insecticides, and destroying competing plant species, may also help manage pest issues, they do not fall under the umbrella of biological control. Traps might capture pests but do not involve biological interactions; synthetic insecticides offer chemical solutions that can have significant side effects; and the removal of plant species can disrupt the ecosystem rather than promote a balanced control method.