Read the lines from Langston Hughes’s poem "I, Too, Sing America."

But I laugh,
And eat well,
And grow strong.

The lines promoted cultural change in the United States in the mid-1900s because they

a
showed that African Americans can have a sense of humor.
b
encouraged African Americans to feel powerful.
c
showed that African Americans were a growing population.
d
demonstrated that African Americans can enjoy life.