The correct option is B. When Dennis Chavez became senator of the United States, he introduced many civil rights policies like the Fair Employment Practice, which aim was to end discrimination in the workplace.
The innovations led to an increase in deforestation and pollution so environmental issues. But it allowed the United States to be a strong country economically and politically.
The key reason for Calvin Coolidge's victory in the 1924 presidential election is that they managed to get voters from southern states to vote for him!
Hope this helps!
Is there options for the question, or is this just a generalized question?