What must be done when leaving pesticides unsupervised in a vehicle?

When leaving pesticides unsupervised in a vehicle, it is essential to ensure that the pesticide is locked in an enclosed part of the vehicle. This action minimizes the risk of accidental exposure or misuse by unauthorized individuals, particularly children or pets. Keeping the pesticides secure in a locked compartment helps to comply with safety regulations and responsible pesticide storage practices, protecting public health and the environment.

The other choices present methods that lack proper safety measures. Leaving the windows down could invite unauthorized access and increase the chance of spills or the spread of toxic fumes. Allowing the vehicle to be accessible to the public poses a significant risk, as anyone could potentially access the pesticides. Simply making them invisible does not provide adequate security, as pesticides can still be tampered with or stolen, posing safety hazards. Therefore, securing them in a locked space is the best and safest choice.