Discussion
Which fault does a cracked or melted substrate produce?
Answer: C
A crack lets gas through without filtering, and the pressure drop falls. The last option explains exactly that signature, which makes it a correct and more diagnostic version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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