Answer: c. a narrator who knows the thoughts and sees the actions of all the characters in a story.
Explanation: The third-person omniscient narrator is a narrator who knows the thoughts and sees the actions of all the characters in a story. Omniscient narrator means that the narrator knows everything that happens in the story, and what the characters think and see. He can tell the story from any character in the story. The omniscient narrator is an all-knowing narrator. One disadvantage is that there is no intimacy with the reader, as there is in a first-person narrative.