What is the definition of pests?

The correct definition identifies pests as organisms that negatively impact agricultural practices. This encompasses a broad range of species, including insects, weeds, pathogens, and even vertebrates that can harm crops or interfere with farming operations. By understanding pests in this inclusive way, it allows for effective pest management strategies that address not just invertebrates or disease agents, but any organism that poses a threat to the health and productivity of agricultural systems.

In contrast, only considering invertebrates, vertebrates, or specific pathogens limits the understanding of what pests can be. Many types of organisms, including plants classified as weeds or even larger animals like rodents, can significantly affect agricultural yield and sustainability. This is why Option B is the most accurate and comprehensive definition of pests.