When a Father Asks Why His Child with Tetralogy of Fallot

When a father asks why his child with tetralogy of Fallot seems to favor a squatting position, the nurse would explain that squatting:

A) Increases the return of venous blood back to the heart
B) Decreases arterial blood flow away from the heart
C) Is a common resting position when a child is tachycardic
D) Increases the workload of the heart