Which statement correctly defines a residue as a pesticide that remains active/effective for an extended period?

• A. Refers to pesticide after it has dried up.
• B. Is a pesticide that remains active/effective for an extended period.
• C. A pesticide remaining immediately after an application.
• D. The area to be evacuated.

Answer: (B)

Residue refers to the portion of a pesticide that remains in the environment after application and can continue to be active for some time. The best choice captures this persistence—the pesticide staying active or effective for an extended period—which is exactly what a residue implies in safety and regulatory contexts. Describing it as drying up implies no remaining activity, and saying it remains only immediately after application misses the sense of lasting presence. The area to be evacuated is unrelated to the definition of residue.