Your roommate is pregnant and she gets very angry and yells quite a bit over the smallest things. What is a good piece of advice that you could give her?

a. It is OK if she gets upset, but she should not yell. It will harm the fetus's hearing.
b. Getting angry and yelling is good for the fetus since it will raise the fetus's heart rate.
c. She should probably get a different boyfriend. He is not going to be a very good father .
d. That she should try relaxation therapy. Whenever she gets really upset, her fetus gets very upset too.

D. Fetuses generally move more and have faster heart rates when their mothers are stressed.