Listening to the music at a loud volume .
I'm pretty sure the answer to this question is choice D.
Answer:
C. They should last 20 to 30 minutes,
Explanation:
Birth defects can be caused wither by internal genetic factors or external factors like drugs, radiation, smoking,...
Dana, who is concerned about the possibility that her baby will have defects, may do the following tests: screening test, that will show if she might have child with birth defect and diagnostic test like amniocentesis (analyzing small amount of amniotic fluid from the area surrounding the baby) which is more than 90% correct.
B is the answer to this question
