Final answer:
Learning requires focused attention, making it important to minimize distractions and manage one's study environment to facilitate metacognition and deep learning.
Step-by-step explanation:
The correct answer is A. Because learning requires focused attention. While staying busy might involve various activities, learning, especially cognitive learning, is a complex process that demands a high level of focus and concentration from the brain. Engaging in activities that scatter one's attention can be detrimental to the deep, focused thought required for learning. Additionally, the brain operates better with automated shortcuts compared to novel tasks that require a great deal of conscious thought and attention, as identified by cognitive research.
When considering good study habits, it's important to manage your workspace and give yourself ample time to think through problems clearly with minimal distractions. Metacognition, or the awareness and understanding of one's own thought processes, is facilitated by being in an environment conducive to such focused, attentive thought.