In my opinion, the correct answer is A. celebratory. Not just because the poem begins with the famous incantation "I celebrate myself, and sing myself", but because its very purpose is the celebration of a personal and collective identity. He celebrates a nation, a universe, nature, sex, human bonds, love, pride. He celebrates himself as Walt Whitman, but also as an epitome of a human being, and an epitome of a new American spirit.
The speaker had an unpleasant experience of America and had a negative first impression. This feeling stayed with the speaker even after the event.
He shot his arrow through the seven trees because it was a challenge. It was done to prove his strength, valor, and skill. Not only did it do that, but it also pierced a mountain, entered earth, made a circle and came through the other side and went back into Rama's quiver.
