Final answer:
D) Walt Whitman. Allen Ginsberg was greatly influenced by Walt Whitman.
Step-by-step explanation:
The missing influence among the authors mentioned who greatly influenced Allen Ginsberg is D) Walt Whitman.
Ginsberg's poetic style is characterized by long, free Whitmanesque lines that find their rhythms in everyday American speech. He was inspired by a cosmic vision in which he heard the godly voice of British romantic poet William Blake reciting his poems. Furthermore, in the poem "A Supermarket in California," Ginsberg imagines walking with his poetic ancestor Walt Whitman, showing him what America has become.