A public health report states: 'In the first year of the new traffic calming measures, pedestrian injuries in the city center decreased by 30%. However, in the same period, cycling accidents rose by 15%. The adjacent suburban district, which did not implement the new measures, saw a 5% decrease in both pedestrian injuries and cycling accidents.' Which of the following is the most valid conclusion based on this text?
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A
The traffic calming measures are entirely detrimental to road safety.
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B
The suburban district's road safety approach is superior to the city center's.
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C
The traffic calming measures may have had a mixed effect on road user safety in the city center.
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D
The increase in cycling accidents in the city center is a direct result of fewer pedestrian injuries.