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.
True, you want them to understand you as easily as possible and they will not know slang, etc. if they speak little english
Both Bad because it rots your brain and good if you watch things like the presidential election interviews
