Yes. He saw them has a subject (he), a verb (saw), and an object (them), so it is totally a sentence.
In Oedipus rex, sphinx symbolises the Oedipus courage, when Oedipus courageously without being scared of the death accepted the riddle of sphinx. He gave the correct answer of his riddle. Which cause him disappear and he died at that very moment.So it was the courage that caused a great set back to the death.
The answer for this would be “B”
