Which Statement Most Accurately Describes the Procedure Known as Amniocentesis

Which statement most accurately describes the procedure known as amniocentesis?

A) A sample of chorionic tissue is extracted through the cervix and examined for abnormalities.
B) An embryo is removed from the uterus, examined for problems, and then reimplanted.
C) Fetal cells in the amniotic fluid are extracted through the abdominal wall and examined for abnormalities.
D) Ultrasonic waves are used to generate an image of the fetus and surrounding structures.