The figure shows a gate made of a uniform plate of height 4 m and width 1 m, hinged about it a horizontal axis through its center of gravity, G. Depth of water on the upstream side of the plate, h is 3 m. The magnitude of the minimum force (kN) that must be applied at A to keep the gate in the vertical position is most nearly （ ）。 A. 22 B. 26 C. 41 D. 66