The correct answer is B. When part "A" is moved to the right, this will cause part "B" to move to the left, and part "C" will also move to the right, but will lag behind the movement of part "A". This is because the device shown is controlling the output of an axial piston pump, and the movement of the parts is directly related to the pump's operation. Specifically, as part "A" is moved to the right, it changes the angle of the pump's swash plate, which in turn causes the pump's pistons to move in the opposite direction, resulting in part "B" moving to the left and part "C" moving to the right, but lagging behind the movement of part "A". The other options are incorrect because they do not accurately describe the relationship between the movement of the different parts of the device.