All of the Following Are Arguments in Favor of Legalizing

All of the following are arguments in favor of legalizing same-sex marriage except:

A) Same-sex marriages benefit only children who are of the same sex as his/her parents.
B) Same-sex marriage would strengthen same-sex families that already exist.
C) Children would be better off if their parents were legally married.
D) Attitudes and laws change. Interracial marriages were prohibited until 1967.
E) There is no scientific evidence showing that children would be harmed by same-sex marriage.