Which Test Is Most Often Performed at 8 to 11

Multiple Choice

Which test is most often performed at 8 to 11 weeks, and involves inserting a needle (abdominally) or a catheter (cervically) into the substance of the placenta (but staying outside the amniotic sac) and removing 10 to 15 milligrams of tissue, which is cleaned of maternal uterine tissue, and then grown in a culture so that a karyotype can be made?

A) amniocentesis
B) chorionic villus sampling (CVS)
C) sonoembryology
D) embryoscopy