Final answer:
The most effective means of controlling chemical hazards is through Engineering controls, as these aim to remove the hazard at its source and minimize exposure.
Step-by-step explanation:
The most effective means of controlling chemical hazards is B) Engineering controls. According to OSHA, employers should prioritize eliminating or reducing hazards by implementing changes in working conditions, such as switching to safer chemicals or using ventilation systems, over relying on personal protective equipment (PPE). Engineering controls directly minimize employees' exposure to hazardous chemicals and are considered more effective because they provide a barrier between the worker and the hazards.