Answer:
Option C, hypocalcemia
Step-by-step explanation:
The mechanism of action for laxative medications like docusate is to, essentially, recruit water to enter the colon and soften fecal mass such that passage is made much easier. Where water goes, electrolytes will follow; in particular, those electrolytes are most commonly sodium, potassium, and magnesium, thereby ruling out options A (hyponatremia), B (hypokalemia), and D (hypomagnesemia) respectively. The least likely electrolyte abnormality comes by way of calcium so option C, hypocalcemia. This is because calcium is available at lower concentrations in stool than the above electrolytes.