SAT Question 6d44060a: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Overall Text Structure
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Works of moral philosophy, such as Plato’s Republic or Aristotle’s Nicomachean Ethics, are partly concerned with how to live a morally good life. But philosopher Jonathan Barnes argues that works that present a method of living such a life without also supplying a motive are inherently useful only to those already wishing to be morally good—those with no desire for moral goodness will not choose to follow their rules. However, some works of moral philosophy attempt to describe what constitutes a morally good life while also proposing reasons for living one.
58
Difficulty:Hard
Which choice best describes the overall structure of the text?