Choice A reason:Tracking rates of illness caused by infection among employees would help in detecting biological hazards rather than physical ones. While important, it does not directly relate to the detection of physical hazards such as noise, radiation, or temperature extremes. Choice B reason:Measuring noise levels is a direct method for detecting potential physical hazards in the workplace. Excessive noise can lead to hearing loss and other health issues, making it a critical physical hazard to identify and mitigate. Choice C reason:Identifying industrial toxins deals with chemical hazards. While these are significant concerns within a work environment, they are not classified as physical hazards, which are related to energy and matter. Choice D reason:Surveying workers about job-related emotional stress is useful for identifying psychosocial hazards. These are important but distinct from physical hazards, which are tangible and can be measured with instruments.