Which of the following statements about infertility is true?
a) In the West, from about the 4th century BCE to the 1800's, the reigning explanation for infertility was based on a theory that both women and men must produce a seed in order for conception to occur, and that the seed was released through orgasm.
b) Rates of infertility in the United States have been inconsistent over the past century.
c) Rates of infertility in the United States have been about 20%–25% of couples.
d) A worldwide assessment of infertility between 1990 and 2010 found that rates had stayed consistent at about 30%–35%.
Answer: a
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