31. A rectangular buoy with cross section A and thickness h floats on the water surface.Jane waits for the buoy to reach static equilibrium and pushes the buoy 1 cm intothe water, then releases it. Jane measured that the frequency of oscillation of thebuoy was f1. John did the same experiment, but he pushed the buoy 2 cm into thewater. The frequency of oscillation is said to be f2. It is assumed that the dampingis negligible, so only buoyancy and gravity need to be considered. In addition, thedensity of the buoy is uniform and the buoy is never completely submerged bywater. Which of the following statements is correct?
(A)f1 ＞ f2 , because the magnitude of the buoyancy force is greater in Jane's case.
(B)f_{2 ＞ f1 , because the magnitude of the buoyancy force is greater in John's case.
(C)f1 ＞ f2 , because the magnitude of the buoyancy force is greater in John's case.
(D)f2 ＞ f1 , because the magnitude of the buoyancy force is greater in Jane's case.
(E)f1 =f2 .}