Discussion
Which sensor infers recirculation flow indirectly?
Answer: B
Opening the valve displaces fresh air, and the air mass reading falls accordingly. The last option explains exactly that inference, which makes it a correct and more instructive version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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