Which of the following best describes the concept of spacing in studying?

The concept of spacing in studying is best described as distributing study sessions over longer periods for better retention. This technique, often referred to as spaced repetition, helps combat the forgetting curve, which shows that information is more easily forgotten soon after it is learned. By spacing out study sessions, learners give their brains time to consolidate and retrieve information, leading to improved long-term memory retention. Research indicates that spaced studying is more effective than cramming or massed practice, where information is studied all at once in a shorter timeframe.

In contrast, studying continuously for long hours can lead to fatigue and diminishing returns on retention, making it less effective than spaced study sessions. Focusing on one topic at a time until mastered, while beneficial for in-depth understanding, does not incorporate the spacing effect that promotes retention over time. Employing group studies can foster collaborative learning and engagement but does not necessarily align with the spacing effect principle unless sessions are distributed over time. Thus, option C captures the essence of effective studying through the practice of spacing.