Discussion
Which conclusion follows if air mass does not fall when the valve is commanded open?
Answer: C
No change in air mass means no gas is flowing. The last option lists the possible causes, which makes it a correct and more careful version. The sensor is genuinely one candidate among several. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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