Discussion
Which observation supports treating the outer flow of a vortex as irrotational?
Answer: C
An inverse radius profile is the signature of irrotational flow, and it is observed in the outer parts of tornadoes and hurricanes. The final option is in fact an equivalent statement, since constant circulation with radius is exactly what zero vorticity outside the core implies, so it is a consequence rather than independent evidence. The pressure deficit follows from the balance and says nothing about the radial profile. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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