The correct answer is C) The stress on know and fate emphasizes the speaker's certainty that he will die in combat.
The name of the poem itself is - An Irish Airman Foresees His Death - so obviously the poem will have something to do with dying, or fear of death. Option C is the only one which shows such an emotion - A is incorrect because friends are not mentioned anywhere in the excerpt, and B is incorrect because we don't see him being selfish - we see him reconciling with the fact that he is going to die.
