It provides a characterization about a field of thought by noting two works in it and then details a way in which some works in that field are more comprehensive than others.

It mentions two renowned works and then claims that despite their popularity it is impossible for these works to serve the purpose their authors intended.

It summarizes the history of a field of thought by discussing two works and then proposes a topic of further research for specialists in that field.

It describes two influential works and then explains why one is more widely read than the other.

English

PASSAGE:
Works of moral philosophy, such as Plato’s <em>Republic</em> or Aristotle’s <em>Nicomachean Ethics</em>, 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.

QUESTION: Which choice best describes the overall structure of the text?