The norms for marriage have become weaker,leaving it to be considered more optional.Andrew Cherlin calls this:

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The deinstitutionalization of marriage refers to the weakening of cultural norms surrounding marriage and the declining influence of traditional institutions (such as religion and the government) in regulating marriage. This can result in marriage being seen as more optional or less socially necessary. Andrew Cherlin has written extensively on this topic. A is incorrect because marriage diversity refers to the wide range of marriage patterns and arrangements found across different cultural, social and legal contexts. C is also incorrect because cohabitation trend refers to an increase in couples choosing to live together without getting married, which is related to but not synonymous with the deinstitutionalization of marriage. D is not an accurate term and is not a scholarly concept.

The Norms for Marriage Have Become Weaker,leaving It to Be