Discussion
Which advantage does direct wind observation have over deriving the wind from pressure?
Answer: A
Because the geostrophic relation involves a spatial derivative, small errors in the mass field produce large errors in the derived wind, whereas a direct measurement carries only its own instrumental error. This is why wind profilers, aircraft reports and satellite-derived winds are so valuable in data assimilation. Cost and latitude are not the relevant considerations, and pressure observations are in fact widely available. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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