Which of the following statements is true about narrative text? a. it is only written to entertain or inform readers. b. it has so many purposes there is no clear definition. c. it may inform, persuade, entertain, inspire, or teach. d. it has no purpose other than to persuade people to buy it.

Essentially, a narrative text is a text that tells a story.  It describes the form of a text, not its purpose. it can serve multiple purposes, so the correct answer is 

c. It may inform, persuade, entertain, inspire, or teach.

this will all depend on the content of the narrative text, not on its form. We can easily imagine that a story will teach or entertain for example, depending on what is inside of the story.