Which of the following is an example of an engineering control?

The correct choice, sharps containers, is an example of an engineering control because it involves a physical means of minimizing exposure to hazards. Engineering controls are designed to isolate people from the hazards they encounter in the workplace. In this case, sharps containers are specifically designed to safely dispose of needles and other sharp instruments, thereby reducing the risk of injury or infection. By providing a designated, secure method for disposing of sharp objects, sharps containers effectively mitigate the risk they pose to healthcare workers and others who may come into contact with potentially hazardous items.

Other options represent different aspects of safety protocols. Personal protective equipment consists of items like gloves and masks worn to shield individuals from exposure to hazards, but it does not reduce the hazard itself. Safety training programs focus on educating employees about risks and safe practices but do not provide a physical barrier against hazards. Written safety procedures outline necessary protocols and guidelines for safe operations but lack the physical features inherent in engineering controls. Thus, while all these options contribute to workplace safety, sharps containers stand out as a true engineering control aimed at reducing risk through physical means.