What are the three methods used to manage accidental invaders?

The correct option outlines the three essential methods for managing accidental invaders effectively. Exclusion involves implementing physical barriers or modifications to prevent pests from entering a structure. This could include sealing cracks, using screens, and ensuring that doors and windows fit tightly. It is a proactive approach that effectively reduces the likelihood of pest infestations.

Habitat modification focuses on changing the environment to make it less conducive for pests to thrive. This can include removing standing water, reducing clutter, and maintaining proper sanitation practices. By altering the habitat, pests are less likely to find food, water, and shelter, which ultimately decreases their populations.

Chemical controls, while often considered a last resort or supplementary method, involve the careful use of pesticides to manage pest populations. This is typically employed when other methods are insufficient or when there is a significant infestation already present.

Together, these three methods create a comprehensive strategy for managing accidental invaders, focusing on prevention, environmental adjustment, and direct control when necessary.