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Which reason makes mass per distance the appropriate unit?

  • A.Nothing
  • B.A large engine emitting the same concentration produces far more pollutant, so the flow must be included
  • C.It accounts for the volume of gas as well as its concentration
  • D.None, since concentration alone is proportional to the pollution produced by any vehicle over any distance

Answer: C

Mass is concentration multiplied by flow. The last option explains exactly why the distinction matters, which makes it a correct and more instructive version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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