Answer:
A. How did people respond to the different conflicts?
B. If this kind of conflict took place today, what might be the result?
D. How did conflict affect the Yakama Indian's claim to their territory?
Explanation:
A research question is a type of inquiry which is done before doing research. Research questions helps a researcher to answer those queries in his/her research paper. To have a good thesis, researchers needs to have effective and good research questions; questions that are debatable, that requires digging deeply, questions that are authentic and specific, etc.
From the given questions, the questions that are effective and good are in options A, B, and D. Questions in these options have the elements of effective research questions. They are debatable, requires digging at deeper-level, and are also authentic.
Therefore, options A, B, and D are correct.