I believe the answer is: Family structures are changing, but families remain important to American life.
The main reason of the changing structures is the increase in divorce rate, and non-monogamous relationship. In the past, almost all children only have one father and one mother. In recent years, children could have more than 2 parents or even only one (in case of single parenthood)
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D) the cost for both plans are exactly the same for 500 text messages
