Part a: which sentence describes the main theme of the poem?
a it’s important to remain hopeful, even in the face of adversity.
b social change and progress takes place more quickly than you realize.
c people often don’t realize the depth of their own prejudice.
d the color of your skin doesn’t determine whether or not you’re american.

Option D - The color of your skin doesn’t determine whether or not you’re American.

Explanation:

The white man shows how different people with different jobs, Ranges from wood cutters, mechanics, manson, shoemakers are singing American songs while working. Also the whiteman didn't discriminate Colour, age or gender, be it young or aged, black or white, men or women.

The best option is "D"

The color of your skin doesn’t determine whether or not you’re American.

Explanation:

In the poem " I hear America singing" & "I too" it was shown how various individuals with various employments, Ranging from wood cutters, mechanics, manson, shoemakers are singing American melodies while working. Likewise the whiteman didn't separate Color, age or sexual orientation, be it youthful or matured, dark or white, men or ladies.