Read the following excerpt from "The World Without Us" by Alan Weisman:

Almost every other compound in nature contracts when frozen, but H2O [water} molecules do the opposite, organizing themselves into elegant hexagonal crystals that take up about 9% more than space than they did when sloshing around in a liquid state. Pretty six-sided crystals suggest snowflakes so gossamer it's hard to conceive of them pushing apart slabs of sidewalk.

Which statement best describes the effect of the metaphor on the excerpts meaning?

A. It compares the sloshing liquid to a river of water able to push apart the sidewalk,
B. It makes the frozen crystals seem like friends to the city to contrast with what a deceitful foe they are.
C. It compares the frozen crystals to delicately lacy snowflakes having an unexpected strength.
D. It liken H2O molecules to hexagonal crystals, which are actually larger than people imagine.