Respuesta :
The correct answer is answer A ("Review or summary").
In a preface or abstract you might be able to understand what an author's purpose is but probably not their viewpoint until you read on.
The bibliography will give credibility to the source and help you recognize what kind of material it aligns with, but it has nothing to do with purpose or viewpoint.
Finally, the conclusion has more to do with viewpoint than purpose, and will be more focused on contrasting initial thoughts with final thoughts after studying a topic.
In order to get a better idea of what a source's purpose and viewpoint is, I'd read a summary or review. This generally entails a more detailed yet brief overview of a source's content in its entirety, which is what you're looking for.
Hope this helps!
B- Preface or abstract would give you an idea of the source's purpose and viewpoint. The writer writes his/ her purpose in the abstract and also his/ her viewpoint . In this way, the reader can get a brief idea of the writer's stance and this will invite the reader to read or not to read the rest of the paper.
A- Review or summary would give you somebody else's idea of the source.
C- Bibliography would give you the information about the sources that have been used to write the source in question.
D- conclusion is just a part of the whole source. If you just read the conclusion, you may get an incomplete idea of what the whole source may be about.