Answer:
A It compares the sloshing liquid to a river of water etc.
Step-by-step explanation:
A metaphor is a comparison of two (different) things and this type of figurative lenguage is often used for dramatic effect. Such as the river of water able to push apart the sidewalk. A and C are comparisons but in the case of C there is no real comparison nor a difference: a snowflake is a frozen cristal.