The correct answer is C.

Explanation: The word "salient" means most noticeable or prominent; it describes something that stands out.

- C. prominent is the nearest in meaning to "salient," as it means something that is important or noticeable.

Other options:
- A. provoking: This means causing a strong reaction, which does not fit the meaning of "salient."
- B. attractive: This means pleasing to the eye or appealing, which is not the same as being prominent or noticeable.
- D. useful: This means serving a purpose or being helpful, which does not convey the idea of something standing out or being noticeable.

Thus, "prominent" is the option that best matches the meaning of "salient."