Which explains how Langston Hughes's "I, Too, Sing America" alludes to Walt Whitman's "I Hear America Singing"?
O Hughes's poem uses Whitman's idea that people of all races should be included in American society.
O Hughes's poem uses Whitman's idea that people of all professions have the right to sing out loud.
O Hughes's poem uses Whitman's idea that all Americans are important members of this country's society.
O Hughes's poem uses Whitman's idea that the working class of America needs to be celebrated.

Hughes's poem uses Whitman's idea that all Americans are important members of this country's society.

Explanation:

Walt Whitman's poem, "I Hear America Singing", celebrates the American society in all its diversity. Whitman writes about people who have different professions and lives. Despite the differences between them, they all feel free in their country.

"I, Too, Sing America", Langston Hughes' poem, contains similar ideas as in Whitman's poem. The speaker of the poem is a black man. His place in the society is metaphorically described, and he is compared to a "darker brother" who is hidden from the guests and must eat in the kitchen when they come. The poem is about equality, the same idea explored in "I Hear America Singing." In Hughes' poem, the author wants to point out that black people are equal and important members of their society, just like all the other people.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.