Gwendolyn Is Having a Prenatal Test Where Her Doctor Uses

Multiple Choice

Gwendolyn is having a prenatal test where her doctor uses high-frequency sound waves directed into her abdomen to check on her fetus. Her doctor is checking for many things, including spina bifida. She is most likely having a(n) :

A) chorionic villus sampling.
B) triple screen.
C) amniocentesis.
D) ultrasound sonography.