Which BEST describes the social and educational philosophy of nineteenth century American reformer Horace Mann?

Responses
A Education is the responsibility of private citizens.Education is the responsibility of private citizens.
B Wherever there is education, there is social hierarchy.Wherever there is education, there is social hierarchy.
C Sectarian education is the only way to provide quality education.Sectarian education is the only way to provide quality education.
D Good schools are the key to a socially equal, morally upright society.

D Good schools are the key to a socially equal, morally upright society.