A 58-year-old woman on chronic furosemide 40 mg twice daily for heart failure presents with weakness, muscle cramps, and constipation. She has not been taking her potassium supplement. On examination, she is fatigued with diminished deep tendon reflexes. Serum potassium is 2.6 mEq/L, magnesium is 1.4 mg/dL. Her ECG shows the changes marked as **C** in the diagram. Which of the following is the PRIMARY electrophysiological mechanism underlying the ECG abnormality at **C**?
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