A nurse is caring for an infant who has Tetralogy of Fallot and notes that the infant is easily fatigued when eating. The nurse should recognize that the infant's fatigue is caused by which of the following?

A. Lack of adequate ventricle strength to pump blood to the body: While right ventricular hypertrophy is part of Tetralogy of Fallot, the primary cause of fatigue is inadequate oxygenation, not muscle strength. B. Restricted blood flow leaving the heart: This contributes to low oxygen levels but isn’t the direct reason for fatigue; the issue lies in oxygen availability for metabolism. C. Inadequate oxygenation for supporting energy metabolism: The structural defects cause reduced oxygen delivery to tissues, leading to fatigue during activities like feeding. D. Increased circulation pressure to the lungs: Pulmonary stenosis reduces blood flow to the lungs, but this doesn’t directly explain fatigue from eating.