Final answer:
In the workplace law context, an 'injury' may include mental conditions due to stress or an accident arising out of employment, but does not include pre-existing conditions or diseases due to substances.
Step-by-step explanation:
When discussing injuries in the workplace, it is important to clarify the definition as it pertains to laws and insurance. In the context provided, an "injury" encompasses (A) mental or nervous conditions due to fright, stress, or excitement experienced solely because of these factors, (D) personal injury or death by "accident", arising out of work performed in the course of employment.
This definition is essential when relating to workman's compensation insurance, which is designed to help employees who have suffered from workplace injuries or accidents.
However, (B) pre-existing medical or health conditions that an employee had before employment, and (C) diseases due to alcohol or drugs, like alcoholism or drug addiction, are generally not included.
The concept of Denial of Injury, where an individual downplays the significance of their actions when no apparent harm is observed, is also pertinent. It is crucial for both employers and employees to understand the full scope of what constitutes an injury to ensure appropriate measures and compensation can be provided.