Which description applies only to the author of a story?

Question

gives personal opinions about characters in a story
makes decisions about how the narration will be told
is the voice telling the story to the reader

Answer 1

The description that applies only to the author of a story is:

makes decisions about how the narration will be told

While the narration can also involve a narrative voice that might express opinions and tell the story, the author is the one who ultimately makes the decisions regarding the narrative style, structure, and perspective.