During a routine prenatal care visit, a pregnant woman in her last trimester of pregnancy reports that she has occasional shortness of breath. The nurse instructs her that: 
A) a chest x-ray is likely indicated. 
B) the nurse will assess her lung sounds and determine whether she has pneumonia. 
C) a prompt referral for follow up care will be made. 
D) breathing becomes increasingly difficult as the diaphragm is displaced.