What Is the Primary Question That Should Be Addressed When

What is the primary question that should be addressed when evaluating published research reports in a literature review?

A) To what extent do the findings reflect the truth (the true state of affairs) ?
B) Have the authors conducted an adequate literature review in their research report?
C) Did the authors cite appropriately from the previously published literature related to the problem under study?
D) Was the research question appropriate considering the available evidence at the time of the study?