Read the lines from "Piano" by D. H. Lawrence.

Softly, in the dusk, a woman is singing to me;Taking me back down the vista of years, till I seeA child sitting under the piano, in the boom of the tingling stringsAnd pressing the small, poised feet of a mother who smiles as she sings.

Which options clearly reveal how the poet's choice of words establishes tone? (Select all that apply.)

a) Nostalgic and sentimental
b) Harsh and critical
c) Joyful and exuberant
d) Melancholic and reflectiv