Which of the following psychological statements is most authentic and scientifically valid regarding the Zone of Proximal Development (ZPD) and Scaffolding under Lev Vygotsky's Socio-Cultural Theory of Development, and their implications for cognitive expansion and collaborative learning in classroom teaching?

In Lev Vygotsky's socio-cultural theory of development, the Zone of Proximal Development (ZPD) indicates the distance between a child's ability to solve problems independently and their ability to solve problems under the guidance of an adult or More Knowledgeable Other (MKO). Scaffolding is the temporary, flexible, and structured support provided during this process, which is gradually faded as the learner becomes proficient in that task, ultimately enabling them to achieve autonomy and self-regulation. Therefore, option (C) most accurately defines the scientific and classroom implications of this concept.