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

The choice of introducing natural predators to pest populations exemplifies a biological control method because it relies on natural mechanisms to manage pest populations instead of using synthetic substances or mechanical interventions. Biological control leverages natural enemies—such as predators, parasites, or pathogens—to suppress pest numbers. This approach can create a more sustainable pest management strategy, as it tends to be less harmful to the environment and can maintain ecological balance.

Employing synthetic pesticides relies on chemical formulations to kill pests and does not utilize biological organisms, thus falling outside the scope of biological control. Planting genetically modified crops is a method of pest management that often alters plant traits for resistance but does not directly involve the manipulation of natural predator-prey relationships. Mechanical traps target pests through physical means rather than a biological approach, which also sets it apart from biological control methods.