单选题：Which of the following safety developments is NOT mentioned

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题目内容：
Which of the following safety developments is NOT mentioned in the passage? A．Windscreens that can help drivers to improve their vision.
B．Radars that can help drivers to see obstacles in fog.
C．Devices that can help drivers to see through big vehicles.
D．Improvements in seat belts, pedal controls and tyres.

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