One documented trend that is a sign of family change is that

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More states and countries are legalizing same-sex marriage, leading to more gay and lesbian couples getting married. This is a clear sign of family change, as marriage is one of the most traditional and recognized family institutions. The other options are incorrect: A is false, as the number of cohabitating couples has been increasing; C is false, as the divorce rate has been on the rise since the mid-20th century; and D is false, as people are actually marrying at a later age than they did in the past.

One Documented Trend That Is a Sign of Family Change