Answer:
The idea that is best supported by this paragraph is:
C) The different levels of social circles have increased as people have become more connected.
The paragraph discusses how people's social connections have changed over the past 50 years. It explains that most people's acquaintances can be compared to the rings of Saturn, with the innermost bands representing the most intimate connections and each successive loop becoming less intimate. This suggests that people have different levels or layers of social circles, ranging from close friends and family in the innermost ring to online acquaintances with shared interests in the outermost rings. The paragraph implies that as people have become more connected through technology, they have invested more time in both the innermost and outermost rings of their social circles, resulting in an increase in the different levels of social connections. Therefore, the idea that the different levels of social circles have increased as people have become more connected is best supported by this paragraph.