**Core Concept**
Rigor mortis is a well-documented postmortem change characterized by stiffening of the body due to an imbalance of ionic calcium and potassium. This phenomenon occurs due to the cessation of cellular ATP production and the subsequent activation of the calcium-mediated cross-bridge cycling in skeletal muscle cells.

**Why the Correct Answer is Right**
Rigor mortis typically sets in 2-4 hours after death and peaks between 12-24 hours. It affects all skeletal muscles except for those in the eye, due to the unique anatomy of the extraocular muscles. The presence of rigor mortis is often used as a key indicator of the postmortem interval.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because rigor mortis is indeed seen in the muscles of the face and neck, including the jaw and tongue.

**Option B:** Rigor mortis is seen in the muscles of the abdomen, including those of the abdominal wall and internal organs.

**Option C:** Rigor mortis is seen in the muscles of the limbs, including the upper and lower limbs, which contribute to the characteristic stiffness of the body.

**Clinical Pearl / High-Yield Fact**
An important clinical correlation to remember is that rigor mortis can be delayed or absent in cases of hyperkalemia, which can lead to prolonged muscle stiffness. Additionally, the presence of rigor mortis can be a key indicator of the postmortem interval, helping forensic pathologists estimate the time since death.

**Correct Answer:** D.