The figure of speech that involves an implied comparison is a metaphor (C). A metaphor compares two different things by stating that one thing is another. It doesn't use "like" or "as" as a simile does.
For example:
- "Her voice was music to his ears." In this metaphor, the comparison is implied - her voice is compared to music without using "like" or "as."
So, in the question given, the correct answer is C. Metaphor.