Which conclusion can best be drawn from this study?
A) Women of age 20 or younger never have a child with Down syndrome.
B) Women in this study who were 45 years old had three times the incidence of babies with Down syndrome as did 40-year-old women.
C) Many babies with Down syndrome die before birth.
D) For 40-year-old women around the world, ten births per thousand have Down syndrome.
Answer: B
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