What is an assumption historians make when they evaluate a source of information?

They know that the experts give the most accurate information about the event or the historical process. Explanation:

Historians usually assume that the source of information they are evaluating is the most accurate because they consider that a source of information written by an expert, a researcher or an eyewitness reporter for example is most likely to be correct because they have studied a lot about the specific topic or because they experienced the particular event.

the answer would be a i think?

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).