A father asks why his child with tetralogy of Fallot seems to favor a squatting position. What is the nurse's best response?

A. Squatting is a common resting position when a child is tachycardic: The squatting position is not primarily a response to tachycardia but a compensatory mechanism for hypoxemia related to a cardiac defect. B. Squatting increases the workload of the heart: While squatting may alter hemodynamics, it improves oxygenation and reduces the symptoms of hypoxia without significantly increasing cardiac workload. C. Squatting increases the return of venous blood back to the heart: Squatting increases systemic vascular resistance, which reduces right-to-left shunting through the ventricular septal defect and improves pulmonary blood flow and oxygenation. It also enhances venous return, helping the heart pump more effectively and reducing symptoms like cyanosis D. Squatting decreases arterial blood flow away from the heart: This is vague and does not accurately explain the physiology. It doesn't directly relate to the benefit squatting provides in tetralogy of Fallot.