**Core Concept**
Cementogenesis is the process of formation of cementum, a bone-like tissue covering the root of a tooth, which is essential for periodontal attachment and tooth anchorage. This process is crucial for the healing of the periodontal wound after root end resection.

**Why the Correct Answer is Right**
Cementogenesis begins after the initial inflammatory and repair phases, around 14-21 days post-root end resection. This is because the initial healing phase involves the formation of a blood clot, followed by the migration of cells such as cementoblasts and fibroblasts to the wound site, which eventually leads to the deposition of cementum. This process is facilitated by growth factors and other molecules that promote cell proliferation and differentiation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because cementogenesis does not begin immediately after root end resection. The initial healing phase involves inflammation and the formation of a blood clot, which is not conducive to cementum formation.
**Option B:** This option is incorrect because cementogenesis is a complex process that involves the coordinated action of multiple cell types and growth factors, and cannot be accelerated by simply increasing the rate of wound healing.
**Option C:** This option is incorrect because cementogenesis is a distinct process from bone formation, and the timing of cementogenesis is not directly related to the timing of bone formation in the jaw.

**Clinical Pearl / High-Yield Fact**
It's essential to note that cementogenesis can be influenced by various factors, including the presence of growth factors, the composition of the blood clot, and the presence of any remaining bacteria or foreign materials in the wound site.

**Correct Answer: B. 14-21 days**