Which of the four choices is the original line that the poet described himself in the first edition of Leaves of Grass as a persona created as part of his goal to revolutionize American poetry?

A、Walt Whitman am I, a Kosmos, of mighty Manhattan the son.;

B、Walt Whitman am I, of mighty Manhattan the son.;

C、Walt Whitman, a kosmos, of Manhattan the son.;

D、Walt Whitman, an American, one of the roughs, a kosmos.