In "i, too, sing america." why did langston hughes most likely allude to walt whitman's poem "i hear america singing"? check all that apply.

to prove that he had read whitman's poem
to write about similar themes as whitman
to expand on the ideas in whitman's poem
to link his poem with another great american poem
to demonstrate that he was a better poet than whitman

Explanation:

In Whitman's poem we can see several groups of people who sing to  America. Whitman, described these groups composed of men and women, nurses, mechanics, woodcutters, among others. However, Whitman did not mention the blacks in his poem and that is where Hughes's poem comes in.  Hughes expands Withman's poem, stating that blacks also belong to America and that they also sing to America

Another thing Hughes did in expanding Withman's poem was to link his poem with another great American poem, so he would gain more visibility for his social critique and his work.