**Core Concept**
Rhabdomyolysis is a clinical syndrome resulting from direct or indirect muscle injury, leading to the breakdown of skeletal muscle cells and release of intracellular contents into the bloodstream. This condition can cause acute kidney injury (AKI) due to the accumulation of myoglobin and other muscle-derived substances.

**Why the Correct Answer is Right**
The release of myoglobin from damaged muscle cells can lead to acute tubular necrosis (ATN) in the kidneys, resulting in AKI. Myoglobin can cause vasoconstriction and tubular obstruction, further exacerbating renal damage. The severity of rhabdomyolysis correlates with the extent of muscle injury and the rate of myoglobin release into the bloodstream.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because myoglobinuria, while a consequence of rhabdomyolysis, is not the primary cause of AKI in this scenario.
**Option B:** This option is incorrect because while hyperkalemia can be a complication of rhabdomyolysis, it is not the most likely cause of AKI in this context.
**Option C:** This option is incorrect because while myoglobin can cause vasoconstriction, it is not the primary mechanism leading to AKI in rhabdomyolysis.

**Clinical Pearl / High-Yield Fact**
Early recognition of rhabdomyolysis is crucial, and prompt fluid resuscitation can help prevent AKI by diluting myoglobin and promoting its excretion.

**Correct Answer:** C. Acute kidney injury due to rhabdomyolysis.