Which set of lines in this excerpt from W.B. Yeats's "An Irish Airman Foresees His Death" suggests that the speaker voluntarily chose to take part in the war?
1.) I know that I shall meet my fate
2.) Somewhere among the clouds above;
3.) Those that I fight I do not hate,
Those that I guard I do not love;
4.) No likely end could bring them loss
Or leave them happier than before.
5.) Nor law, nor duty bade me fight,
Nor public men, nor cheering crowds,
