5.PART A: Which of the following best identifies a central idea of this text? * A. By forming unions, workers protected their rights and made important social changes

B. Children were the first members of labor unions before the trend spread among adult workers.
C. Workers acted illegally and outside the law, so their strikes were not always respected.
D. Labor unions were a popular trend in the past, but after the Industrial Revolution, workers have moved
beyond them.
All of the above