The energy from the drop causes a column of water from the pool to "bounce" up in response, similar to a trampoline. Which one of the following statements accurately describes why this effect occurs?

a. Water molecules bond together in covalent bonds. This makes water very dense in comparison with other liquids. Therefore, the density of water makes it too heavy to fly out in every direction, as in an explosion.
b. Water molecules "pull" at each other through hydrogen bonds, keeping them grouped together as the drop of water hits the pool, rather than flying out in every direction, as in an explosion.
c. Water can break down into hydrogen and hydroxide ions, and these ions are heavier than normal molecules of water. They are too heavy to fly out in every direction, as in an explosion.