## **Core Concept**
Ergonomics, or human factors engineering, focuses on designing and arranging workspaces to minimize discomfort, fatigue, and risk of injury. It aims to optimize workplace efficiency, safety, and employee well-being by fitting the job to the worker. A key aspect of ergonomics is adapting the physical environment to reduce musculoskeletal disorders and other work-related health issues.

## **Why the Correct Answer is Right**
The correct answer, **C. Workspace anthropometry**, is crucial because it involves designing workspaces that accommodate the physical characteristics of the workers, such as height, reach, and strength. Proper workspace anthropometry ensures that workers can perform tasks without straining or stretching, thereby reducing the risk of musculoskeletal disorders. This includes adjusting chair heights, desk levels, and monitor positions to fit the average worker's dimensions.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While improving lighting can enhance visibility and reduce eye strain, it is not the most critical factor in the physical design of a sedentary job. Proper lighting is essential but is more about environmental comfort than physical job design.
- **Option B:** Noise reduction is vital for auditory comfort and reducing distractions but is not directly related to the physical design aspects that prevent musculoskeletal disorders or improve productivity in sedentary jobs.
- **Option D:** Although temperature control is crucial for worker comfort and can affect productivity, it does not directly influence the physical design of a sedentary job in terms of ergonomics and musculoskeletal health.

## **Clinical Pearl / High-Yield Fact**
A memorable point for ergonomics is the **"90-degree rule"**: Ensure that the worker's elbows are at a 90-degree angle, wrists straight, and feet flat on the floor or on a footrest. This simple guideline helps in setting up a workstation that minimizes strain on muscles and joints.

## **Correct Answer:** C. Workspace anthropometry