‘Leaves of Grass’ was written by ___________ ?

A. Shelley
B. Long Lellow
C. Frost
D. Walt Whitman

Leaves of Grass is a poetry collection by the American poet Walt Whitman (1819–1892). Although the first edition was published in 1855, Whitman spent most of his professional life writing and re-writing Leaves of Grass, revising it multiple times until his death.