Final answer:
A minority of young people in developed countries see marriage as an important marker of the transition into adulthood, preferring non-traditional family structures or committed relationships without formal marriage.
Step-by-step explanation:
Based on the provided references, it can be inferred that A) A minority of young people see marriage as an important marker of the transition into adulthood in developed countries. A trend toward delaying or opting out of marriage is evident, with an increasing number of young individuals preferring to live with a partner. The values and beliefs of the youth have changed as a result of shifts in social norms and socioeconomic opportunities, especially with an increase in acceptance and prevalence of non-traditional family structures, and varying attitudes towards sex and sexuality. However, it's important to note that this does not mean that young people have completely abandoned traditional values, as many still express desire for monogamy and committed relationships.
Learn more about Youth Attitudes Towards Marriage