Final answer:
Pest elimination is typically performed by local agencies, may include sterile insects, and is not always economical and easy to achieve.
Step-by-step explanation:
Typically, pest elimination is not performed by government agencies (option a). Instead, it is usually performed by local agencies, such as pest control companies or local government authorities (option d). Pest elimination may include the use of sterile insects as a control method (option b), which involves mass rearing and release of sterile insects to reduce the population of pest insects. This method has been employed successfully for some pest species. However, it is important to note that pest elimination is not always economical and easy to achieve (option c), as it depends on various factors such as the target pest species, available resources, and environmental conditions.