The correct response regarding the relationship between an ocean wave and the energy of that wave is:
Wave energy is directly proportional to the amplitude of the wave.
In ocean waves, wave energy is related to both the amplitude (height) of the wave and the square of the wave height. Larger waves carry more energy.
While frequency and wavelength do have relationships to wave energy (higher frequency waves generally carry more energy), the statement about energy decreasing as waves approach shore is not accurate in general, as the energy can change due to factors like wave refraction and breaking.
Thus, the most straightforward and correct statement is regarding the relationship between wave energy and amplitude.