Part a: which statement expresses the central idea of the text? a. johnson, jackson, and vaughan challenged prejudice at naca to accomplish what african american women had never been allowed or expected to do before. b. while all naca "computers" advance women and african american rights, johnson was responsible for grabbing the nation’s attention. c. the public wasn’t aware of african american women’s role in naca until recently because the organization kept their involvement a secret. d. johnson, jackson, and vaughan would have gone on to accomplish great things at naca if it weren’t for the discrimination they faced because of their gender and race.