Final answer:
Chorionic villus sampling (CVS) is the riskiest prenatal procedure, posing a higher risk of miscarriage compared to other options.
Explanation:
Chorionic villus sampling (CVS) is the most dangerous prenatal procedure among the options provided. CVS involves removing a sample of the placental tissue, and it carries a higher risk of miscarriage compared to other procedures like amniocentesis or ultrasound. Although CVS can be performed earlier in pregnancy, typically between 10-12 weeks, its associated risks make it a critical consideration in prenatal care.
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