The correct answer is C) formulating effective questions.
What is not required for historical inquiry is formulating effective questions.
Historical inquiry helps us to organize events to explain the past. Historical inquiry is based on open ended-questioning. We start by asking historical questions that can guide us. Then you analyze historical sources to get some historical evidence that is going to help us to have historical interpretations.
It would probably be The collection of relevant fact because you would need once classified documents, effective questions, and evaluation of evidence to be able to make the inquiry. Hope it helps.
