Which Scenario Best Represents Lev Vygotsky's View of Mental and Behavioral

Which scenario best represents Lev Vygotsky's view of mental and behavioral development?

A) A teacher assigns challenging tasks that students then try to complete on their own.
B) An instructor helps students do laboratory work,showing them how to do things the students cannot yet do.
C) A teacher waits patiently for students to come up with good answers and then reinforces them with praise and affection.
D) An instructor systematically tests students to find out which mental abilities they do have and which they do not have.