Handlers typically receive the most exposure on their... while mixers receive _____% on hands and _____% on forearms.

The correct choice highlights the fact that handlers typically receive the most exposure through their hands and forearms, which is consistent with the nature of their tasks that often involve direct contact with herbicides. The specified exposure rates of 85% on hands and 13% on forearms reflect the significant risk associated with handling these substances, as the hands are usually in direct contact with them.

Understanding the levels of exposure for mixers is crucial for safety protocols. Mixers often perform tasks that involve preparing and diluting herbicides, which can lead to considerable exposure on their hands due to the handling of concentrated chemicals. The relatively lower percentage of exposure on forearms acknowledges that while some contact may occur there—perhaps from splashes or spills—the primary concern is the direct handling done with the hands. This knowledge emphasizes the need for appropriate personal protective equipment (PPE) to minimize the risk of herbicide exposure to handlers and mixers alike.