A central idea is a natural selction.
Answer:
C
"While I nodded, nearly napping, suddenly there came a tapping,"
Explanation:
Answer C describes how the narrator was aroused by his unexpected guest's knocking at the door. Therefore, this best supports the idea that the speaker wasn't expecting anyone to come by.
A third person narrator knows all the characters' feelings and thoughts, an author might choose this perspective to let the reader know everything the characters are feeling and what's going on. This gives a broader perspective on the story and can influence the readers opnion.