Concept:The learning curve shows progress over time. A plateau is a flat phase with no visible improvement, often caused by boredom or physical exhaustion.
Explanation:The learning curve has three stages: slow beginning, steep progress, and plateau.
In the plateau stage, the learner has already mastered the concept.
The learner feels bored or tired from doing the same task repeatedly.
This fatigue reduces motivation and performance, causing a flat curve.
Therefore, a plateau is mainly due to fatigue, not maturation, motivation, or interest alone.
Answer:C. fatigue
