Third-person omniscient narrators are likely to be reliable because <span>they're impersonal and know everything about the story. In this type of point of view, the narrator can narrate the events from one character to another with all the needed information without causing confusion as to their interrelationship.</span>
The narrator goes to visit Usher, because his friend Roderick sent him a letter requesting his company. Roderick wrote he was feeling physically and emotionally ill so the narrator rushes to see him.
The answer is preposition, that shows the location of something.
