Many people would get sick from the pollution that was a product from coal smoke and working, hard, long hours without any form of a break. Plus, since large machinery was relatively new in this time era, they were particularly unsafe and lead to many workplace related accidents and deaths.
The answer is B, because Langston Hughes is saying that a dream forgotten and left behind is like a raisin drying up in the sun.
Rosemary seems quite mute as a person based on the first paragraph of A Cup of Tea. I would have to read more into Rosemary before I made a judgement, solely because of the Great Gatsby with Jay Gatsby where he seemed the same, however he turned out to be a completely different person from what he was portayed as by everyone.