An American Crisis in Schools Between 1890‒1915 Occurred

An American crisis in schools between 1890‒1915 occurred

A) when they doubled in size.
B) students were much more eager and easier to teach than before.
C) new policies toward child labour forced parents to send their children to school in order avoid the cruel treatment they would otherwise receive in the workplace.
D) when the "select few" were much less capable than the students teachers previously had in their classrooms.