Social-constructivist theorist Vygotsky emphasizes interaction andengagement with the target language in a social context based on theconcept of ______ and scaffolding. ()
A、“Communicative Language Teaching” (CLT)
B、“Zone of Proximal Development” (ZPD)
C、“Task-based Language Teaching” (TBLT)
D、“Total Physical Response” (TPR)