Answer:
B.title of the work being analyzed
Step-by-step explanation:
The keywords related to the title of the work being analyzed would produce the most focused results in a database search because if you are trying to find what other critics say about a word, which all of these will have in common is that they will mention the title of the work and that will be the easiest way to find them and without limiting the search to a specific opinion.
The author first and last name will produce results that could mention different works of the writer. Words selected from the working thesis can also result on finding things related to different works that talk about the same topic. The title of a critical article would limit the search to the specif opinion in there.