**Core Concept**
The question is testing the anatomical knowledge of the muscles in the neck and their innervation. The correct answer is a muscle that receives dual nerve supply, meaning it is innervated by two different nerves.

**Why the Correct Answer is Right**
The sternocleidomastoid muscle (SCM) is a muscle in the neck that is responsible for rotating the head and flexing the neck. It is unique because it receives dual nerve supply from the accessory nerve (cranial nerve XI) and the cervical plexus (C2-C3). The accessory nerve provides motor innervation to the sternal head, while the cervical plexus provides motor innervation to the clavicular head. This dual innervation allows for precise control over the movement of the head and neck.

**Why Each Wrong Option is Incorrect**
**Option A:** Omohyoid muscle - This muscle is also innervated by the cervical plexus, but it does not receive dual nerve supply.
**Option B:** Scalene muscles - These muscles are innervated by the cervical plexus, but they do not receive dual nerve supply.
**Option C:** Digastric muscle - This muscle is innervated by two nerves, but the question is asking about a muscle in the neck.

**Clinical Pearl / High-Yield Fact**
The sternocleidomastoid muscle is a key muscle in the neck that can be involved in several clinical conditions, including torticollis and sternocleidomastoid tumor.

**Correct Answer:** D. Sternocleidomastoid muscle