Final answer:
A pesticide does not need to be locked if it cannot be reached by children.
Step-by-step explanation:
A pesticide does not need to be locked if it cannot be reached by children. This means that option B, "It cannot be reached by children," is the correct answer. If a pesticide is stored in a location that is inaccessible to children, such as in a locked cabinet or in the cab of a truck, it does not need to be locked.