The correct answer is D. Encyclopedia
Explanation:
In research there are multiple sources that can be used in order to get information; however, not all sources provide the same information and because of this, the type of source used depends on the topic that is being studied. In the case of Katie, she wants to focus on the "Trail of Tears" which is a historical event that occurred in the U.S. between 1831 and 1877, this implies Katie need a source that provides historical information and therefore the most beneficial source to her is an encyclopedia because encyclopedias are sources that provide general information about a variety of subjects including history and therefore Katie can find general information in an encyclopedia about the "Trail of Tears". Additionally, this is the only source with historical information as atlas provides maps and geographical information, thesaurus provides synonyms and related terms to a word and almanac provide information about the events that will occur in the year.
