**Core Concept**
The coracoid process is a small hook-like structure attached to the scapula, serving as an anchor point for several muscles and ligaments. These muscles and ligaments play a crucial role in the movement and stability of the shoulder joint. Understanding the attachments to the coracoid process is essential for diagnosing and treating various shoulder disorders.

**Why the Correct Answer is Right**
The correct answer involves identifying which of the listed structures is not attached to the coracoid process. The coracoid process is primarily attached to the following muscles and ligaments:
* **Pectoralis minor**: originates from the coracoid process and inserts into the ribs.
* **Short head of the biceps brachii**: also originates from the coracoid process and inserts into the radial tuberosity.
* **Coracobrachialis**: originates from the coracoid process and inserts into the humerus.
* **Pectoralis major**: although it is a large muscle, it does not originate from the coracoid process, but rather from the sternum and clavicle.

**Why Each Wrong Option is Incorrect**
* **Option A:** Pectoralis minor is indeed attached to the coracoid process, making this option incorrect.
* **Option C:** Coracobrachialis is also attached to the coracoid process, so this option is incorrect as well.
* **Option D:** Although pectoralis major does not originate from the coracoid process, the question asks for the option that is "attached" to it, which is not a precise description of its origin. However, the more accurate answer is that pectoralis major does not originate from the coracoid process.

**Clinical Pearl / High-Yield Fact**
When assessing shoulder injuries, it's essential to consider the attachments of the muscles and ligaments to the coracoid process, as damage to these structures can lead to shoulder instability and pain.

**Correct Answer: D. Pectoralis major**