This structure is more likely than the first. Structure 'C' has its lone pairs separated by 120 degrees. The chlorine atoms are separated by 90 degrees. This structure is also polar and the most likely choice. It is more important to allow maximum separation for the lone pairs as opposed to the chlorine atoms.
Water is one of the most fascinating molecules.
Its shape contributes to other unique properties. Water is one of the few molecules whose density decreases as it solidifies from the liquid state. Most liquids become more dense while solidifying. As benzene freezes, its solid sinks to the bottom of its container. Ice, on the other hand, floats.