**Core Concept**
In human anatomy, the elevation of ribs is a crucial movement that occurs during breathing, specifically during inspiration. This movement is facilitated by the intercostal muscles and the accessory muscles of respiration. The intercostal muscles include the external intercostal muscles, which are responsible for elevating the ribs.

**Why the Correct Answer is Right**
The correct answer would be the muscle that does not participate in elevating the ribs. The scalene muscles (A) are accessory muscles of respiration that elevate the first and second ribs. The sternocleidomastoid muscle (B) can also help elevate the ribs during inspiration. The internal intercostal muscles (C) actually depress the ribs, not elevate them.

**Why Each Wrong Option is Incorrect**
* **Option A:** The scalene muscles, specifically the anterior and middle scalene muscles, help elevate the first and second ribs during inspiration. They are accessory muscles of respiration.
* **Option B:** The sternocleidomastoid muscle can assist in elevating the ribs during inspiration, especially in conditions of respiratory distress.
* **Option C:** The internal intercostal muscles actually depress the ribs, not elevate them. They are responsible for forced expiration and the downward movement of the ribs.

**Clinical Pearl / High-Yield Fact**
Remember that the scalene muscles and sternocleidomastoid muscle are accessory muscles of respiration that can help elevate the ribs during inspiration, especially in conditions of respiratory distress.

**Correct Answer:** C. Internal intercostal muscles.