Concept:Breaks during prolonged computer use protect the body from the effects of long, fixed posture and screen focus.
Explanation:Sitting at a computer for a long time makes the eyes focus continuously on the screen.
This can cause eye strain, dryness, and difficulty focusing.
It also keeps the neck, shoulders, and arms in one position, leading to muscle fatigue.
Taking intermittent breaks allows the eyes to rest and the muscles to relax.
Answer:C. avoid eye strain and muscle fatigue.