Which of these phrases best describes a uniting principle of progressive era?

the correct answer is

the

third option. in the excerpt from "why equal pay is worth fighting

for" by senator elizabeth warren, she supports her point by noting:

"for middle-class families today, it usually takes two incomes to get by.”

warren supported barbara mikulski’s the paycheck fairness act to combat wage

discrimination, as it would to ensure “that salary differences have

something to do with the actual job that they are doing, and not just because

they are women”.