Which of the Following Lists Different Forms of Prenatal Diagnosis

Multiple Choice

Which of the following lists different forms of prenatal diagnosis from least to most risky?

A) amniocentesis, ultrasound, maternal serum alpha fetoprotein test
B) ultrasound, maternal serum alpha fetoprotein test, amniocentesis
C) maternal serum alpha fetoprotein test, amniocentesis, ultrasound
D) maternal serum alpha fetoprotein test, ultrasound, amniocentesis