Answer:
B. From historical markers.
Explanation:
Historical markers are those plaques, monuments, commemorative stones, metals, or any form that contains information about the history of a place or event. These markers are the correct and written proofs of a historical event that makes up for the most authentic form of accessing or getting information about a historical account.
Historians may get their information from various sources but the most authentic and genuine source one can get information about any historical event will be the historical markers. These monuments/ markers contain texts, images, or even any detail about the historical event and are exact to the point, and thus act as the most trustworthy source to get historical information.
