A Pregnant Woman Is Concerned About Sleeping Positions

A pregnant woman is concerned about sleeping positions. She is only comfortable lying flat on her back. The nurse advises the woman:

A) In the third trimester, side-lying positions are the safest.
B) In the first trimester, pregnant women should not lie prone.
C) In the second trimester, pillows are necessary to prop up the legs.
D) In the third trimester, supine positions help to promote fetal blood flow.