When Compared to Same-Sex Couples, Which Is True About Mixed-Sex

When compared to same-sex couples, which is true about mixed-sex couples?

A) Their relationship is more likely to end than a same-sex relationship.
B) They have less hostility at times of conflict than same-sex couples.
C) They are more likely to stay friends after the end of the relationship than same-sex couples.
D) They are more likely to come from the same socioeconomic demographic than same-sex couples.