"like an arrow presently to his home in the green world beneath"
the FORMAL meaning of concord is a agreement between people or peace
the GRAMMAR meaning of concord is basically the same thing but with gender, people or basically any other GRAMMATICAL that effects the form of words
"Servant to Servants" is a poem that was actually written by Robert Frost and in this poem, the speaker engages herself in an appreciation for her husband. The answer for this would be option D. Hope this answers your question.
