Passage Summary: A theorist claims that we should only jail people if they are dangerous, because other reasons for breaking the law—like not knowing better or making a choice based on your upbringing—don't actually justify such a harsh punishment.

Conclusion: Incarceration is only justifiable when an individual poses a significant threat to the lives or property of others.

Reasoning: The author argues that lawbreaking is caused by either ignorance or free choice, neither of which justifies imprisonment because ignorance is an invalid basis for punishment and free choice is determined by factors outside a person's control.

Analysis: The first sentence serves as the main conclusion of the entire argument. To identify this, notice how every subsequent sentence provides a reason why other justifications for jail (like 'mere lawbreaking') are insufficient. The theorist is systematically ruling out alternative views to leave their opening claim as the only one standing. When looking for the correct answer, prioritize the one that identifies this statement as the primary point the author is attempting to establish.