Regarding Cousin Marriage,which of the Following Statements Is Incorrect

Regarding cousin marriage,which of the following statements is incorrect?

A) the U.S.is the only Western country that has laws against first-cousin marriage.
B) in the U.S. ,19 states permit first-cousin marriage.
C) genetic research does not show that there is marked increase in inheritable weakness for children of first cousins.
D) laws against first-cousin marriage in the U.S.were enacted the popularity of evolutionary theories.
E) in the U.S. ,some states have no laws prohibiting marriage between relatives.