**Core Concept**
The healing of an extraction socket involves the process of primary intention, where the edges of the socket are approximated and the wound is closed. This process is characterized by the formation of a blood clot, which is gradually replaced by granulation tissue and eventually, bone.

**Why the Correct Answer is Right**
In primary intention healing, the edges of the socket are approximated using sutures or other means, allowing the wound to close quickly. The process begins with the formation of a blood clot, which is rich in platelets and fibrinogen. The platelets release growth factors that stimulate the migration of fibroblasts and the formation of granulation tissue. As the granulation tissue matures, it is gradually replaced by bone, which is formed through the process of endochondral ossification.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not describe the primary intention healing process, which involves the approximation of the socket edges and the formation of a blood clot.
* **Option B:** This option is incorrect because it describes a process that occurs in secondary intention healing, where the wound is left open to heal by granulation and contraction.
* **Option C:** This option is incorrect because it describes a process that occurs in secondary intention healing, where the wound is left open to heal by granulation and contraction.

**Clinical Pearl / High-Yield Fact**
In primary intention healing, the edges of the socket are approximated within 24-48 hours, and the wound is closed quickly to minimize the risk of infection and promote healing.

**Correct Answer: C. Primary intention healing is characterized by the approximation of the socket edges and the formation of a blood clot.**