Answer:
It allows the reader to see the story from one of the characters' perspectives.
Step-by-step explanation:
Third-person omniscient narrative is the point of view that is used where the perspective of all characters are viewed from an omniscient, or "all-knowing" angle.
From the book, "The Piece of String", the third person omniscient view makes the reader feel sympathy for the old man because it allows the reader to see the story from one of the characters' perspectives.