Possibly "Ballet is a performance dance that requires great skill and dedication."
The passage that best summarizes the central idea is D. they do not rashly engage in war, unless it be either to defend themselves or their friends from any unjust aggressors, or, out of good nature.
The whole excerpt tells us that Utopians despise war but, nevertheless, train for it and engage in it in certain scenarios. Passage D is the only one that tells us both these things: that they don't like war but engage in it sometimes.
It's the fallacy of stating or thinking that if 'B' came <em>after</em> 'A', then 'A' <em>must have</em> <em>caused</em> 'B'.
Here's a ridiculous example:
Every day at 4:00 in the morning, I rub this gold ring that I always carry
in my pocket, and every day, within two or three hours, the sun rises.
This has been happening regularly, for almost five years now, so I know
that I can totally rely on it..
I'm getting ready to write to my Congressman and tell him that if he does not
send me five million dollars within a week, I will not rub the ring for a week, and
that will cause havoc with farming, transportation, and weather, since the sun
will not rise for a week.
B. He is conflicted with himself over the crime he committed.
