I have a feeling that the answer to your question is letter C.
I hope I have answered it correctly for you.
My answer would be:
the destruction wrought when ambition goes unchecked by moral constraints—finds its most powerful expression in the play's two main characters.
Answer:
Unfair treatment and cheap labor made it nearly impossible for immigrants to achieve the American dream.
Answer:
Claudette decided to stop straightening her hair because it was causing burns, hairloss, or sindging.