Final answer:
All pesticide labels must include the statement 'Keep out of reach of children,' which is essential for preventing poisoning and ensuring safety.
Step-by-step explanation:
The statement that must be on all pesticide labels, as mandated by regulations to ensure safety and prevent poisoning, is A. Keep out of reach of children. Pesticide labels include various warnings and instructions designed to minimize the exposure and risks associated with their use.
Understanding and following these labels is crucial to protecting human health, particularly for those in occupations with high exposure risks such as agricultural workers, retail employees, and emergency responders.