Which of the following BEST determines the maximum height of open ocean waves and is the point where breaking white caps form in a fully developed sea:

W) the cohesive forces in water molecules are overcome and the waves break apart

X) the waves are losing as much energy as breaking white caps as they are receiving from the wind

Y) the trough moves a little bit faster than the crest and the wave becomes unstable

Z) the waves have reached a maximum period
X) THE WAVES ARE LOSING AS MUCH ENERGY AS BREAKING WHITE CAPS AS THEY ARE RECEIVING FROM THE WIND