Which figure of speech compares one subject directly to another without using like or as? a. onomatopoeia b. personification c. simile d. metaphor

Hello, the answer is D, metaphor.
For example, "She is a diamond"

Onomatopoeia is an imitation of a sound. 
For example, "Pow!" or "Boom!"

Personification is giving nonhuman objects human attributes. 
For example, "The branches of the tree danced in the wind"
 
A simile is a comparison using like or as. 
For example, "She is as valuable as a diamond"

Hope this helped. Have a nice day. :) 

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