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Which event prompted the introduction of on road testing?

  • A.The discovery of defeat devices in diesel vehicles
  • B.A change of government, which required the testing regime to be revised for reasons unconnected with any vehicle
  • C.Nothing
  • D.Revelations that some calibrations recognised the laboratory test and behaved differently on the road

Answer: A

Defeat strategies recognising the test were the direct cause. The last option explains exactly what was discovered, which makes it a correct and more precise version of the same answer. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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