C200 feet or four bus lengths to the rear along each side
DThe top of the bus roof for height clearance
✓ Correct answer: C. 200 feet or four bus lengths to the rear along each sidePer CDL manual guidance, outside flat mirrors must be adjusted to show at least 200 feet (approximately four bus lengths) to the rear along each side of the bus so the driver can monitor traffic and students near the sides.
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