I believe it is A, although i'm not 100% sure. Hope I helped:)
An art song is usually for solo voice and is accompanied by solo piano. (Just as a side note, I recommend listening to the Erlking by Schubert if you have time; it's a German art song (lied))
The answer to the given question above would be option B. The sentence that best describes the dramatic situation that opens Oedipus the King is this: <span>The people of Thebes have come to seek help from Oedipus their king, who refuses to help. Hope this answers your question.</span>