The answer is C.
The author provides different facts. For instance, "Unlike normal rocks, they have trails etched behind them as if they have traveled across the sand. Some trails are only a few feet. Some trails are over a half a mile long." Is an example of a fact.
Another example includes, "Some rocks seem to roll as they move forward. Some take unexplainable routes. Large ones have traveled past small ones that have stayed still."
The correct definition of narrative nonfiction would be that it blends elements of narration and nonfiction by describing true events using plots, characterization, and other techniques common in fiction.
