A young, male child is born with severe respiratory failure. Over the course of months, the parents ...

A young, male child is born with severe respiratory failure. Over the course of months, the parents note his body looks swollen. They ask, Is our baby's kidneys not working right? Why is he so swollen?
 
  The nurse bases his or her reply on which of the following physiological principles?
  A) The right side of his heart (cor pulmonale) is not pumping effectively. Blood is backlogging in his body, which is why he is so swollen.
  B) We just need to call the physician and ask him to give you a prescription for more water pills.
  C) Once we get his oxygenation level back to normal, then maybe his kidneys will receive enough oxygenated blood to filter better.
  D) This happens when he has so many secretions in his lungs. Maybe we should try some expectorant to thin his secretions so he can cough them out.