Which of the following is an example of a secondary source?
A. The notes of a doctor who practiced during an influenza epidemic
B. Journal entries of a patient who spent two weeks quarantined during an influenza outbreak
C. A textbook summarizing eyewitness accounts of an influenza epidemic
D. Photographs in a museum exhibit about a world famous influenza outbreak
A secondary source of information is one that was created later by someone who did not experience first-hand or participate in the events or conditions you are researching. They include scholarly books and articles.
Therefore, the Correct Answer is C.