Discussion
Which theorem connects circulation to the flux of vorticity?
Answer: D
Stokes' theorem is the purely mathematical result that the line integral of a vector field around a closed curve equals the surface integral of its curl over any surface spanning that curve. Kelvin, Bjerknes and Ertel theorems are dynamical statements about how those quantities evolve. Distinguishing the mathematical identity from the physical theorems built upon it keeps the logic of this topic clear. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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