Which of the following is included on a pesticide label?

The correct choice highlights key elements that are mandatory on a pesticide label, which are crucial for safe and effective use. Pesticide labels must include the ingredients present in the formulation, which informs users about the active and inert components that may affect handling, safety, and effectiveness. Signal words, such as "Caution," "Warning," or "Danger," indicate the level of toxicity associated with the pesticide, providing essential information for risk assessment and safety precautions. Additionally, directions for use are critical as they guide users on how to apply the pesticide safely and effectively, including application rates, timing, and methods.

The other options listed are not typically found on pesticide labels. While health effects may be addressed, they are not the only information provided. Cost and sales information is not relevant to the safety and usage of the pesticide and is generally absent from product labels. Endorsements or testimonials from agricultural bodies are also not included as they do not provide essential safety or regulatory information that users need for proper handling and application of the pesticide. Thus, option B is comprehensive and necessary, aligning with the regulatory requirements for pesticide labeling.