The discussion of preterm births pointed out that
a. the incidence of preterm birth does not seem to be related to the number of years of education a woman has.
b. no ethnic-group differences have been reported in the incidence of preterm births.
c. women who are overly thin are at risk for a preterm birth.
d. in North America, most babies who are born prematurely are no longer considered at risk for medical complications.
C
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