When Exerting Herself,a 2-Year-Old Female Patient Develops Blue-Colored Lips and Clubbed

When exerting herself,a 2-year-old female patient develops blue-colored lips and clubbed fingers,gasps for air,and breathes heavily.Prior to this age,the patient showed no signs of illness.Clinical tests reveal only pronounced right ventricular hypertrophy accompanied by evidence of pulmonary congestion.What is the most likely cause?

A) Patient has a ventricular septal defect.
B) Patient suffers from transposition of the great vessels.
C) Patient has tetralogy of Fallot.
D) Patient has aortic valvular atresia.
E) Patient has an abnormal atrioventricular node.