Restricted use pesticides must be stored in what manner when unattended?

When it comes to the safe and responsible storage of restricted use pesticides, it is critical to ensure that they are kept in a secure environment to prevent unauthorized access and potential accidents. The correct answer highlights that restricted use pesticides must be stored in a secure, locked enclosure that is clearly marked with a pesticide warning sign.

This practice serves multiple important functions. First, the locked enclosure protects children, pets, and the general public from accidental exposure to these hazardous materials, which can have serious health implications if misused. Secondly, the warning sign acts as a clear communication tool, alerting anyone nearby of the potential dangers associated with these chemicals. This combination of security and clear warning helps mitigate risks associated with pesticide storage and usage.

In contrast, other storage methods such as keeping them open and accessible, or visible for monitoring, create unnecessary hazards by increasing the likelihood of accidental contact or misuse. Additionally, a locked enclosure without a warning sign fails to provide adequate notification regarding the dangers of the substances contained within. Thus, option B is the best practice for the safe storage of restricted use pesticides.