Final answer:
Both A and B are correct answers. A historian requires a well-defined thesis, supportive evidence and sources (both primary and secondary), and objectivity and critical thinking in order to make a valid historical interpretation about an event.
Step-by-step explanation:
A historian requires various items in order to make a valid historical interpretation about an event. First, a historian needs a well-defined thesis related to the event which provides a specific standpoint or argument to be developed. Next, historians need evidence and sources to support their thesis. This includes both primary and secondary sources that are relevant to the event. Primary sources are original documents or objects which were created at the time of the event, while secondary sources are interpretations of those events by other historians or writers. Lastly, objectivity and critical thinking are essential for a historian to avoid bias and make a balanced interpretation.
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