The correct answer is B) these sources provide information written by other authors.
Secondary sources are important to study history because these sources provide information written by other authors.
Direct information or testimonies from the people who were part of the historical events are called primary resources. Secondary resources are books, magazines or articles written by other authors that had made research on the topic at hand.
The other options of the question were A) these sources include bones and weapons. C) museums usually contain the majority of these sources.