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

The choice of using disposal containers for needles and other sharps represents an engineering control because it involves implementing physical changes to the workplace environment or processes to mitigate hazards. Engineering controls are designed to isolate employees from the hazards by making modifications to the tools, equipment, or infrastructure that create safer working conditions.

In this case, the sharp disposal containers eliminate the risk of needle-stick injuries by providing a dedicated, safe location for disposing of sharp objects. This reduces the likelihood of accidents that could occur if sharps were simply thrown away in regular waste bins or left unsecured.

The other options represent different types of approaches to safety. Personal protective equipment (PPE) involves individual measures taken by workers to protect themselves, which is a form of administrative control rather than an engineering solution. Regular health screenings and safety training programs also focus on policies and practices rather than modifying the physical work environment. Thus, they do not fit the definition of engineering controls, which centers around physical interventions.