What is an indicator of performance changes in a worker?

The correct choice highlights that stealing or damaging property serves as a significant indicator of performance changes in a worker. Such behaviors can suggest underlying issues, such as decreased morale, dissatisfaction at work, or other psychological stresses. When an employee engages in misconduct like theft or vandalism, it typically reflects a shift in their attitude or commitment to their workplace. This kind of behavior is often symptomatic of deeper problems that could impact their overall job performance and the environment around them. Therefore, recognizing these actions is crucial for managers and supervisors to address issues early and implement appropriate interventions. It's vital to observe these drastic changes, as they may indicate further decline in performance or other potential risks in the workplace.