Final answer:
A textbook is a secondary resource as it interprets and analyzes primary sources about historical events, unlike an original arrowhead or mummy, which are primary sources.
Step-by-step explanation:
The student has asked which of the following is a secondary resource: A) Original Native American arrowhead B) A newspaper article from the 1890s C) A textbook D) A mummy in a museum. A secondary resource is one that is created after the events have occurred and usually interprets primary sources. Therefore, the correct answer is C) A textbook. This is because textbooks compile information from primary sources and provide an analysis or interpretation of historical events, which is characteristic of secondary sources. In contrast, an original arrowhead or a mummy would be primary sources, as they are original objects from the time period. A newspaper article from the time period in question could be considered a primary source as it presents a first-hand account of events.