**Core Concept**
Collagen is the most abundant protein in the human body, and it is composed of amino acids that provide its unique structure and properties. The amino acid composition of collagen is distinct from other proteins, with a high proportion of glycine, proline, and hydroxyproline.

**Why the Correct Answer is Right**
The correct answer is a combination of amino acids that are essential for the triple-helix structure of collagen. Glycine is the smallest amino acid and is found at every third position in the collagen sequence, allowing for the tight packing of the triple helix. Proline and hydroxyproline are essential for the stability of the collagen helix, as they form hydrogen bonds that contribute to the protein's strength and rigidity. The unique composition of collagen amino acids provides the necessary structure for its role in skin, bones, tendons, and ligaments.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not include glycine, which is a crucial component of collagen.
* **Option B:** This option is incorrect because it does not include proline, which is essential for the stability of the collagen helix.
* **Option C:** This option is incorrect because it does not include hydroxyproline, which is involved in the formation of hydrogen bonds that contribute to collagen's strength and rigidity.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the unique amino acid composition of collagen is responsible for its strength and rigidity, making it a critical component of connective tissue. A deficiency in collagen can lead to conditions such as osteogenesis imperfecta, a genetic disorder characterized by fragile bones.

**Correct Answer:**
Glycine, Proline, Hydroxyproline