For an arbitrary inviscid and incompressible flow, with all the body forces zero, what is best described by the given sketch?

For an arbitrary inviscid and incompressible flow, with all the body forces zero, what is best described by the given sketch? Correct Answer Kelvin’s Circulation Theorem

For the same fluid elements in closed curves C1 and C2, the circulation remains constant with time as the fluid elements move downstream. This is essentially Kelvin’s circulation theorem.
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