Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the __________.

Correct Answer: Option B — floating ring and cylinder body

In a variable displacement radial piston pump, the floating ring's position relative to the cylinder body determines the piston stroke length. Shifting the ring changes the eccentricity, thereby varying the displacement and flow direction. This mechanism allows for precise control of hydraulic output without changing pump speed.