What defines a pest?

A pest is defined as anything that harms humans, animals, plants, or competes for resources, making the definition quite broad. This includes a variety of organisms, not limited to insects or specific environments like gardens. Pests can be weeds, pathogens, insects, animals, or any entities that interfere with human activities or natural ecosystems by causing damage or competition for resources.

The correct answer captures this inclusive definition, emphasizing that pests are not restricted to a single category or location, but rather encompass anything that poses a threat or competition in a relevant context. This understanding is crucial for effective pest management and integrated pest solutions in agriculture, horticulture, and other industries where pest presence can significantly impact productivity and health.