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.
Answer
A. Informal
Explanation
Informal outlines can take the form of brief lists of ideas in the order in which you want to discuss them.
C towards that understanding
Answer:
write a letter to your friends tell him or her about your plans after leaving senior high school
