Which of the following is a method to evaluate chemical safety?

Label instructions serve as a critical method for evaluating chemical safety. They provide essential information about the product, including safe handling practices, necessary personal protective equipment, dosage recommendations, and first aid measures in case of exposure. Properly labeled chemicals ensure users understand the risks associated with the product and how to use it safely, thereby reducing incidents of misuse or accidental exposure.

In contrast to label instructions, conducting user surveys primarily gauges user experience or satisfaction rather than providing direct safety-related guidelines. Environmental impact studies are valuable for assessing the broader ecological consequences of chemical use but do not specifically address safety for individuals handling the chemicals. Pest behavior analysis helps in understanding how pests interact with chemicals but does not focus on the safety profile of the chemicals themselves. Thus, label instructions remain the most direct and crucial method for evaluating chemical safety in practical applications.