SAT English Practice Question

The author of this passage is trying to provide the reader with a clear understanding of a complicated topic. One way the author achieves this is by providing the reader with a specific example that explains how the concept works in a real world situation. However, the author also wants to make sure that the reader does not get confused by the example. What is the most likely reason the author uses the words "for example"?

1. A.introduce a specific example that illustrates the concept.
2. B.explain the history of the concept.
3. C.compare the concept to other similar concepts.
4. D.show the relationship between the concept and other related ideas.