Final answer:
A historian would determine the essay writer's point of view regarding economic issues to assess the validity of the conclusion in the passage.
Step-by-step explanation:
In order to determine whether the passage draws a valid conclusion, a historian would most likely take the action of D. Determining the essay writer's point of view regarding economic issues. By understanding the writer's perspective and potential bias, the historian can assess the reliability and accuracy of the conclusion in the passage.
Learn more about evaluating the validity of an argument in a historical essay