Your roommate's sister-in-law is pregnant and is trying to do all that she can to protect her fetus and to make sure that her fetus develops well

She does not like to have any loud music on and even does not talk very loudly for fear that her fetus will be harmed. What would you tell her?
a. That her fetus will not be adversely affected and that studies have discovered that fetus's actually prefer their mothers' voices. So, she should talk as much as she likes.
b. That she is correct, loud music is readily transmitted through the amniotic fluid and will cause damage to the fetus's cochlea.
c. That she should play Mozart really loudly. Fetuses who listen to Mozart are more intelligent than those who do not listen to Mozart.
d. Research has shown that fetuses' love country music.

A. A fetus's heart rate has been shown to increase when it hears its mother's voice.