Meter is the rhythm of the poetic lines. The stress on know and fate highlights the assurance about the speaker's death in combat is an effect of a meter.
The excerpt is taken from the poem "An Irish Airman Foresees His Death", which surrounds the theme of fear of death and dying. The effect of the meter is emphasized in the statement as the speaker is already aware of his fate.
Other statements are incorrect as friends are not mentioned anywhere in the excerpt and also the speaker is not portrayed as selfish rather is seen to accept the fact of his death.
Therefore, option C. stress on know and fate describes the effect of the meter.
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