how to provide a narrative response?

Answer 1

Just write it out. A narrative is a written response that goes beyond "yes" and "no." Normally you will spell out your reasoning, or how you came up with the answer.

Answer 2

There are four text types typically taught in school; narrative is just one.

The narrative response expects the writer to walk the reader through the reasoning behind an activity or an event.

Here is a brief list of they types of things you might have read that are considered narrative; they can be either true or fiction--the key is a narrator.
Novels
Short Stories
Poetry
Biographies
Letters (not in a business-memo sense)

I hope this has been helpful. Good luck.