Concept:A learning plateau is a flat period in the learning curve where no noticeable progress occurs despite continued practice.Explanation:The learning curve has three stages. In the first stage, progress is slow as the learner begins. In the second stage, progress accelerates rapidly as understanding deepens. In the third stage, a plateau appears. Here, the learner has mastered the concept and feels bored or unmotivated. No new improvement is seen even with more practice. This temporary halt is called a learning plateau. It is not a permanent defect, cessation, or obstruction. It is simply arrested growth – a pause before further progress. Teachers can overcome plateaus by using innovative methods, giving rest, using audio-visual aids, or offering incentives.Answer:A. arrested growth in learning