An example of metaphor is option d, the girl's eyes were deep blue oceans.
A metaphor is a type of figure of speech. A figure of speech deviates from the literal meaning of the words to emphasize or decorate the spoken and written sentences. It is also known as a rhetorical figure. In metaphor, a phrase or a word presenting an object or an idea is used in another word's place suggesting similarity.
For instance, Tina is a rose. Here the person is compared to a rose but instead of stating in detail, it is simply written that Tina is a rose. The meaning is not literal, it is in a figurative sense. Metaphor is different from simile which uses 'as' or 'like' in stating comparisons or similarities. For instance, the sentence given above will be written as Tina is like a rose.
Therefore, option d, the girl's eyes were deep blue oceans is a metaphor. In a literal sense, her eyes are not the ocean. The analogy of deep blue oceans is used metaphorically.
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