Answer:
Step-by-step explanation:
The correct answer is B) an encyclopedia.
The sources that would be best to consult for a summary of historical events in either printed or digital format is an encyclopedia.
An encyclopedia is a book or a collection of books that contain all sorts of information, explanations, photographs about many general interest topics such as history, biology, sociology, and many others. It is a good reference for a secondary resource when doing research. It contains a summary of the main concepts, incidents, activities or examples of the mentioned topics.