**Core Concept**
Succinylcholine, a depolarizing neuromuscular blocking agent, can cause life-threatening hyperkalemia in susceptible patients, leading to cardiac arrest. This is due to its ability to rapidly release potassium ions from muscle cells.

**Why the Correct Answer is Right**
When succinylcholine is administered, it binds to nicotinic acetylcholine receptors on muscle cells, leading to depolarization and the release of potassium ions. In patients with severe burns, trauma, or certain neuromuscular disorders, muscle cells are more prone to depolarization and potassium release. This can cause a rapid increase in serum potassium levels, leading to cardiac arrest. The patient's paraplegia, which may have resulted in muscle atrophy and denervation, increases her risk of succinylcholine-induced hyperkalemia.

**Why Each Wrong Option is Incorrect**
**Option A:** Malignant hyperthermia is a rare but life-threatening complication of volatile anesthetics and succinylcholine, characterized by muscle rigidity, fever, and metabolic acidosis. While it can cause cardiac arrest, it is not the most likely cause in this scenario.

**Option B:** Anaphylaxis is a severe allergic reaction that can cause cardiac arrest, but it is not directly related to the administration of succinylcholine.

**Option C:** Pulmonary aspiration of gastric contents is a risk during intubation, but it is not directly related to the administration of succinylcholine.

**Option D:** Hypovolemia can cause cardiac arrest, but it is not the most likely cause in this scenario, where the patient is undergoing a surgical procedure under general anesthesia.

**Clinical Pearl / High-Yield Fact**
Succinylcholine-induced hyperkalemia is more common in patients with spinal cord injuries, severe burns, or neuromuscular disorders, highlighting the need for careful patient selection and monitoring when using this medication.

**Correct Answer:** C. Malignant hyperthermia is a rare but life-threatening complication of volatile anesthetics and succinylcholine, characterized by muscle rigidity, fever, and metabolic acidosis. While it can cause cardiac arrest, it is not the most likely cause in this scenario.