An ideal, incompressible fluid flows steadily through a horizontal pipe of circular cross section.

The pipe has an initial cross-sectional area \(A_0\), narrows smoothly to a central constriction of area \(\dfrac{1}{2}A_0\), and then widens symmetrically back to area \(A_0\). A series of narrow, open-topped vertical tubes are mounted along the top of the pipe to measure the local static pressure via the liquid column height \(h\).

Which of the following best describes a graph of the column height \(h\) as a function of position \(x\) along the length of the pipe?