Final answer:
a) Chorionic villus sampling (CVS) is a prenatal test that involves the insertion of a soft plastic tube into the vagina to collect a small sample of cells from the placenta. It is commonly performed between the 10th and 12th week of pregnancy and is used to screen for genetic conditions or chromosomal abnormalities.
Step-by-step explanation:
The correct answer is a. Chorionic villus sampling.
Chorionic villus sampling (CVS) is a prenatal test that is typically performed between the 10th and 12th week of pregnancy. It involves the insertion of a soft plastic tube into the vagina to collect a small sample of cells from the placenta, called chorionic villi.
This procedure allows healthcare professionals to analyze the genetic material of the fetus and screen for certain genetic conditions or chromosomal abnormalities.