Which of the following barriers is NOT a physical distraction?

Emotional stress is classified as a psychological barrier rather than a physical distraction. While it certainly affects an individual's ability to focus and engage, it does not stem from the environment in the same way that physical distractions do.

Physical distractions are tangible aspects of the surroundings that can disrupt concentration, such as room temperature, loud music, or outside distractions like noise from traffic or other people. These elements are measurable and can be altered or managed to improve the learning environment. In contrast, emotional stress originates from internal factors, such as personal concerns, and is not a physical presence in the environment, making it distinct from the other options provided. This distinction is important in understanding the different types of barriers that can affect teaching and learning effectiveness.