Final answer:
Historians ask why, when, what, and who when investigating the past.
Step-by-step explanation:
The subject of the question is History. Historians ask five key questions when investigating the past: why, when, what, and who. These questions help historians uncover the motives, time period, events, and people involved in a historical event or era. For example, asking 'why' can help historians understand the underlying reasons behind a particular event, while asking 'who' can reveal the individuals responsible.
Learn more about Investigating the past through historical questions