Discussion

Explanation:

Research the relevant text. The author says a few lines above that harm cannot be allowed without justifiable cause, leading to the argument in the quote that liberty has to exist within this limitation. Where might this assertion run into problems when applying it to specific situations? Most likely with the vagueness of "justifiable cause. " (A) resolves the problem.

Wrong answers:
Option (b): Out of Scope. The length of punishment has nothing to do with whether people should be punished.
Option (c): Out of Scope. The author has already expressed his opinions in the passage. This answer choice smells a bit like an ad hominem attack that does nothing to answer the question.
Option (d): Out of Scope. Just like (C), the author's personal opinions have nothing to do with either the question or the passage.

Hence, option (a).

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