Answer:
is that a question?
if it is then what is it?
Explanation:
Because Radley is much older than them, and Scout, Jim, and Dill find him interesting because of this.
I believe the correct is the third option. It is important to preview sources before using them in your research because it reveals deeper concepts. Reading deeply the sources would allow you to have a deeper understanding of the sources and determine which parts of the sources are useful to your research.