Many students find that their study habits significantly impact their academic performance. Those who establish a consistent study schedule often report better retention of information and higher grades. Additionally, the use of active learning techniques, such as summarizing material and teaching concepts to peers, enhances understanding. However, some students struggle to find the right balance between studying and leisure activities, which can lead to stress and decreased productivity.
Based on the paragraph, which of the following statements would most reasonably complete the sentence below?
The variation in student performance suggests that ______