I believe the answer is D. The way the workers were treated by big business and big industry.
Answer:
Katherine is given the assignment to write up reports and, because the majority of the research is hers, she assigns them to “Paul Stafford and Mary Goble.” On a rainy day, Katherine sprints the long distance to use the Colored Women's room. When she returns, Al asks her why she is gone for so long every day.
Explanation:
He studied for along time and finally figure out a vaccine and because of this humans are happy and healthy
