Answer:
The main reason education reformers wanted to establish public schools was (D) So immigrants could learn about democracy
Explanation:
The main motive of the reform movement in education was that each child gets education. ''Horace Mann'' was ''the father of American public schools''.
The role of 'public schools' is very critical. They not only shape the future of the child but also prepare the students to be 'citizens' of a democratic country. The voters should be intelligent enough who can distinguish and choose between the leaders who show interest in the nation and ones who don't. They wanted to teach students to be good "democratic" citizens.