The correct answer is D. Each snowflake was a diamond.
Step-by-step explanation:
In language, a metaphor is a figure of speech that occurs as the writer or speaker uses an object or idea to name a specific object, place or person. This means in metaphors the writer makes an implicit comparison usually to make a speech or text more aesthetically or to create symbolism. According to this, the option that shows metaphor better is "Each snowflake was a diamond" because, in this, the author uses the "diamond" to describe and name the "snowflakes" creating an implied comparison as this suggest diamonds and snowflakes are alike.