USMLE Step 2 - Question 3

An 24 year old female with no significant past medical history presents to her primary care physcician due to intermittent palpitations. She states that they occur randomly, can last for many minutes at a time, and make her dizzy. She denies any syncope. Her blood pressure is 120/80, heart rate 70, and respirations 12. Physcial examination is normal. Laboratory studies are normal including thyroid function testing. Her ECG is below. What is her diagnosis? 

A. Congenital prolonged QT syndrome

B. Lown-Ganong-Levine syndrome

C. Wolff-Parkinson-White syndrome

D. Ventricular tachycardia