They are different things
One realism element in the book Like Water for Chocolate is magical realism, which is the use of magic in a real world but fictional setting.
The figure of speech used in the phrase "babes of the sea" is (D) a metaphor. A metaphor is a figure of speech that consists in a comparison. This comparison is made between two things that are not related but have a certain characteristic in common. In this case, "babes" is not used in its original meaning but the author refers to his feeling of insignificance when compared to the nature.
Try looking in a different perspective, think about more situations and use clichés but not to many!
