Kurt, a Sociologist, Claims That Unmarried Couples Are Less Likely

Kurt, a sociologist, claims that unmarried couples are less likely to be happy than their married counterparts.Which of the following accurate statements strengthens Kurt's argument?

A) Unlike their married counterparts, unmarried couples cannot legally raise their children as their own.
B) Unlike their unmarried counterparts, married couples tend to have smaller extended family ties.
C) Unlike their unmarried counterparts, married couples are reported to have greater financial security and stability.
D) Unlike their married counterparts, unmarried couples are generally afraid of being ridiculed by society.