In oedipus the king, how does the setting most affect the development of the plot?

The setting changes to add onto the story. how the first king heard from Delphi that he would be killed by his own son and the son was to marry his mother after. So he has a servant bring the son into the mountains and leave it there, The shepherd or king of the next kingdom over finds him and raises him without telling him that he was adopted and wasnt their son. So when Oedipus goes to seek his destiny and hears that he well kill his father and marry his mother, he despairs and leaves to try and change his destiny. Upon his path he murders a charioteer and their servants who didnt show respect and treated him horribly without realizing it was his true father and the king of Thebes (was it thebes? a bit rusty on the names) he travels on and meets the Sphinx, solves her riddle and gets it good with being king there until the truth was uncovered. So as the setting changes, we trail along with it, shifting our moods with the plot and surrounding details

The answer is d. prior knowledge. she breaks it into parts in order to figure out what other words have the same parts to the word and put the meanings together.