The first part when he says he "shall meet my fate" could allude to a choice of joining. This could allude to an acceptance of fate sort of standard and that he made his decision. Another is the last two lines when he says "Nor law... nor cheering crowds." This quotation shows that the government, the duty to his country, the men around him, and those at home cheering them on did not persuade him to fight. In the second last line this is known when he states "nor law nor duty bade me fight".
Sophocles, Electra and Other Plays, Works of Sophocles, The Complete Sophocles, Two Faces of Oedipus, Sophocles: Selected Fragmentary Plays.
I believe the correct is the third option. It is important to preview sources before using them in your research because it reveals deeper concepts. Reading deeply the sources would allow you to have a deeper understanding of the sources and determine which parts of the sources are useful to your research.
