A student asks why they must signal even when no other cars are visible. The BEST trainer response demonstrates which instructional principle?
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A
Authority — telling the student it is required by law and must be obeyed
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B
Relevance — explaining that habits built in low-traffic areas protect the driver when conditions change
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C
Efficiency — advising the student to signal only when needed to save time
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D
Autonomy — letting the student decide based on their own judgment