A. drawing information from a variety of sources.
Option A is correct because when conducting research to prove your thesis, it's important to use information from many sources. Only using one source does not show that the research is sound. Option B is not correct. Sources must be reliable. In order to determine if the source is reliable, it cannot be anonymous. Examining only one side of an argument does not address the counterargument. It is important to address both sides so that the opposite side of the argument can be proven incorrect. Writing the research question after beginning research is also not a good idea. If you don't know the research question, then you can't do the research.