Which of the following is not a secondary source? A. A book B. An autobiography C. A textbook D. An encyclopedia
A secondary source is a resource you would go to as a second reference so you would go to a textbook to look over something as a second reference you would go to an autobiography as a second reference to learn about someone and you would go to a encyclopedia as a second reference so the correct answer is A=book a book is something you read for pleasure not as a reference to something.
The answer is:
A. A book.
Hope that helped !