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

In Lev Vygotsky's socio-cultural theory, the Zone of Proximal Development (ZPD) is the range where a child can perform a task with the guidance of an adult or a More Knowledgeable Other (MKO) that they are unable to do alone. In this process, scaffolding provides temporary support. Option (C) most accurately defines the scientific and classroom implications of this concept.