A 28-year-old male presents with recurrent episodes of palpitations and syncope. A 12-lead ECG during tachycardia shows a wide-complex rhythm with RBBB morphology and left axis deviation (superior axis). Transthoracic echocardiography is normal. The rhythm shown in the diagram is marked as B. Which of the following statements best characterizes the electrophysiological mechanism underlying this arrhythmia?

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