Explanation:
The correct answer is B. Beach erosion usually takes thousands or millions of years.
Beach erosion can occur over a variety of time scales, ranging from short-term events to long-term processes. While some erosion processes on beaches can occur over longer periods, it is not accurate to say that beach erosion usually takes thousands or millions of years. Erosion on beaches can happen through various mechanisms such as wave action, currents, storms, and sea level rise, and its timing and intensity can vary depending on factors such as coastal geology, climate, and human activities.
Therefore, option B is incorrect as it provides an inaccurate statement about beach erosion.
