BThe blind spot area along the sides and rear corners of the bus
CThe entire roof of the bus for bridge clearance
DOncoming traffic in the opposite lane
✓ Correct answer: B. The blind spot area along the sides and rear corners of the busConvex mirrors provide a wide-angle, panoramic view of the sides and rear corners, filling in the blind spots that straight flat mirrors cannot adequately cover due to their limited field of view.
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