How can readers tell that this text is a secondary source?

(1 point)
Responses

It does not have personal stories.
It does not have personal stories.

It does not have general knowledge.
It does not have general knowledge.

It has photographs and drawings.
It has photographs and drawings.

It has an interview with an immigrant.

It has an interview with an immigrant.

Readers can tell that this text is a secondary source because it does not have personal stories.