Which One of the Following Strategies Best Describes the Concept

Which one of the following strategies best describes the concept of metacognitive scaffolding?

A) Provide support mechanisms that can help students use newly acquired learning strategies.
B) Teach students the importance of thinking carefully about the things they are learning.
C) Guide students step-by-step through problem-solving algorithms.
D) Teach students that successful learning often does not occur in a rapid all-or-none fashion, but instead may take considerable time and effort on their part.