Over his 65-year life span, Hughes, one of America’s most enduring writers and a key figure in the Harlem Renaissance of the 1920’s, will have published hundreds of poems, plus novels, short stories, autobiographies, librettos, essays and children’s books.
The best answer is E. Choices A, B and D use tenses that can only be used for the living. Hughes, the subject of the sentence, is deceased, as is evidenced by the sentence. Choice C sets up a condition would have published... but the condition is then not specified.