What is the zone of proximal development, and why is it important for learning?

• A. A fixed range of tasks a learner can do without help; it determines independence.
• B. The range between what a learner can do with and without help; guides scaffolding to move tasks to independent ability.
• C. The set of tasks beyond a learner's capability regardless of support; it serves as a goal to avoid.
• D. The time period when a learner is most capable; it determines optimal test times.

Answer: (B)