Formal Systems of Education Developed in Modern Societies Because

Formal systems of education developed in modern societies because:

A) mass education promoted internationalism, helping citizens from different regions and backgrounds to share knowledge and experiences
B) schools promoted the development of personality traits such as self-discipline and obedience, which employers needed in their employees
C) schools provided the credentials needed for a job and credentialism helped to erode the class structure in a society
D) people became less individualistic with industrialization