A teacher pre-tests students before a math unit and finds three distinct groups: those who haven't mastered prerequisites, on-level students, and those who already know the unit content. What is the BEST first step?
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A
Teach the entire unit to all students the same way
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B
Plan three differentiated learning paths based on pre-test data
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C
Move advanced students to a higher-grade class permanently
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D
Skip the unit for students who already know the material