A textbook can never be said to be an example of a primary source of information, because it is significantly a secondary source of information. Therefore, option D holds true.
What is the significance of a primary source?
A primary source of information of any literary composition as such is referred to or considered as such a source in which the information taken relates to a first-hand data, and is also originally collected for compiling into such information.
A textbook contains the information available in other sources. It also contains essays, stories, poems, or theories, which are not the original works of the author who has compiled the contents of a textbook. Thus, a textbook is a secondary source.
Therefore, the option D holds true regarding the examples of primary sources of information.
Learn more about a primary sources here:
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The question seems to be incomplete. The complete question has been added for better reference.
Which of the following is not an example of a primary source?
a letter
a diary
a newspaper
a textbook
