Which of the following is a cause of workplace accidents?

Employees working outside of their job description can significantly increase the likelihood of workplace accidents. When individuals perform tasks for which they are not properly trained or equipped, they may not be familiar with the potential hazards involved. This lack of training can lead to unsafe practices and inadequate safety measures, increasing the risk of accidents.

For instance, if an employee is asked to operate machinery that they haven't been trained to use, they might not follow the correct operational procedures, leading to mishaps. Furthermore, stepping outside one’s designated role can mean that safety protocols and checklists pertinent to specific tasks may not be followed, compounding the risk of an incident.

In contrast, while excessive breaks, overstaffing, and high employee morale do have their impacts on workplace dynamics and productivity, they are less directly associated with the likelihood of accidents. Excessive breaks might even improve focus when employees return to work, overstaffing doesn't inherently increase safety risks unless it leads to confusion or miscommunication, and high morale generally promotes a positive and safe working environment.