37.Which of the following statements best characterizes Vygotsky’s zone of proximal development?
(A)A process where students develop a skill by learning from their mistakes.
(B)The language system that the learner constructs out of the linguistic input.
(C)A psychological filter that can either facilitate or hinder language production in a second language.
(D)The gap between what a learner has already mastered and what he or she can achieve with support from a teacher.