Which lines in wordsworth's lyric poem "the solitary reaper" present the reaper's song as more beautiful than nature?

a.) behold her, single in the field, yon solitary highland lass! reaping and singing by herself; stop here, or gently pass! alone she cuts and binds the grain, and sings a melancholy strain;

b.) no nightingale did ever chaunt more welcome nots to weary bands of travellers in some shady haunt, among arabian sands: a voice so thrilling ne'er was heard in spring-time from the cuckoo bird,

c.) will no one tell me what she perhaps the plaintive numbers flow for old, unhappy, far-off things, and battles long ago:

d.) whate'er the theme, the maiden sang as if her song could have no ending; i saw her singing at her work, and o'er the sickle bending; -- i listened, motionless and still; and, as i mounted up the hill,