Which of these is not an example of something that can be used as supporting information

A) a real-world example

B) an author opinions

C) a trend in behavior

D) a command

I believe it is D

Explanation:

I believe it is D because A command can not be used as a secondary example in a essay. An authors opinion is something that can be used because they wrote a book on the matter. A trend in behavior can be used because of statistics, it would have been scientifically proven. and a real world example would be the best example of what CAN be used as a secondary example.