A U-Tube Has Dissimilar Arms, One Having Twice the Diameter

Multiple Choice

A U-tube has dissimilar arms, one having twice the diameter of the other.It contains an incompressible fluid and is fitted with a sliding piston in each arm, with each piston in contact with the fluid.When the piston in the narrow arm is pushed down a distance d, the piston in the wide arm rises a distance:

A) d
B) 2d
C) d/2
D) 4d
E) d/4