The lines promoted social change in the United States in the first half of the twentieth century because they spoke about A.. African Americans working as servants

B.. parties hosted by European Americans

C.. European Americans views of African Americans

D.. equal rights for African-Americans

I think its D.. But im not sur

D.

Explanation:

The Lines being mentioned by the question are the following

"Tomorrow,

I'll be at the table

When company comes. "

This is a poem by Langston Hughes's titled "I, Too, Sing America."  This poem speaks about equal rights for African-Americans. It tries to reference segregation of African Americans and Whites as well as how it will soon be coming to an end and shine light on a brighter future.

i really dont know buddy