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Which advice suits an owner using a vehicle for short journeys?

  • A.A periodic longer drive at a steady speed, or reconsidering whether a diesel vehicle suits the use pattern at all
  • B.Include a regular sustained run at higher speed
  • C.Nothing, since the filter will regenerate itself regardless of the manner in which the vehicle is used
  • D.Buy a petrol vehicle

Answer: B

A regular long run keeps the filter healthy, and a diesel may simply be the wrong choice. The last option states both, which makes it a correct and more honest version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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