A teacher notices that a student can solve math problems independently at a 4th-grade level but can solve 5th-grade problems with teacher guidance. According to Vygotsky, the teacher should primarily:
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A
Only assign tasks the student can complete independently
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B
Provide scaffolded support within the 5th-grade challenge level
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C
Wait until the student fully masters 4th-grade content before advancing
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D
Assign 6th-grade problems to maximize the student's challenge