Discussion
Which quantity is meant by the reduced pressure at a station?
Answer: B
Sea level reduction converts station pressure to the value that would be observed at mean sea level, using the hypsometric relation and an assumed temperature for the fictitious column below. Without it, altitude would dominate the analysis entirely. The assumption about that column is the weak point of the procedure and introduces appreciable error at high elevation stations. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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