Based on the given choices, he can establish an effective research topic by choosing the questions in option 4. "Who was Odysseus? Why is he important? How has he influenced today's society"
Having mentioned these sets of questions, one can establish the identity of the person you are taking about, this case, Odysseus. Also, after knowing the subject, one can point out the social relevance and significance of Odysseus and lastly, the impact of the subject to the reader and/or the society.
