Which of the following mothers has the greatest risk of giving birth to a baby who has been harmed by a teratogen?
a. Suzie, an alcoholic, who is not yet pregnant
b. Jasmine, a teenager, who has been pregnant for only 4 weeks
c. Yolanda, age 24 , who is about to give birth
d. Beatrice, a woman over 40 , who is 7 months pregnant