Which of the following is an example of a mechanical pest control method?

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B is the correct choice because using traps to capture rodents or insects is a classic example of a mechanical pest control method. This method involves physically removing pests from an environment without the use of chemicals. Traps can range from simple glue traps to more complex devices that allow for the humane capture of animals, effectively reducing pest populations through direct intervention.

In contrast, the other methods mentioned involve chemical or biological approaches. Spraying pesticides regularly employs chemical substances to eliminate pests, which is not mechanical. Introducing natural predators involves a biological approach where one organism is used to control another, which does not involve mechanical means. Applying insect growth regulators, while effective in managing pest populations, also relies on chemical interventions to disrupt the lifecycle of the pests. Thus, only the use of traps aligns with the definition of mechanical pest control.