Columnist: A democratic society cannot exist unless its citizens have established strong bonds of mutual trust.
Conclusion (it is obvious then)
Widespread reliance on movies and electronic media for entertainment has an inherently corrosive effect on democracy.
Evidence
Democracy requires that citizens have strong bonds of mutual trust.
Such bonds require participation in civic organizations, political parties, and other groups outside the family.
Evaluate
We have a big New Concept in the Conclusion. It's claiming something about , but the argument provides no information about movies, electronic media, or our reliance on the two.
So the correct answer will almost definitely be stating whatever it is the author is assuming about "reliance on movies and electronic media for entertainment".
The first two sentences are both conditionals, and they have a common ingredient (bonds of trust), so we should suspect that these might chain together. Sure enough they do. We get:
Democratic → bonds of → participation in society trust non-family groups
Since the conclusion is talking about something corroding democracy, it would make more sense that the author is intending to use the contrapositive of this.
don't have don't have don't have participation in → bonds of → democratic non-family groups trust society
Goal
If the author must be assuming that when most of us start relying on movies and electronic media for entertainment, then we are less likely to participate in civic organizations / political parties / other non-family groups.