The author of the passage refers to the fact that "disparities between Black and White schools sometimes grew in the early decades of the twentieth century" most likely in order to A. support the argument that the economic struggles of southern Blacks were largely due to educational inequalities B. give an example of the differences between Black schools in the early part of the twentieth century and Black schools starting in the 1940s C. illustrate the unevenness of the progress made by Black schools in the southern United States D. help explain why Black remained politically marginalized and experienced systematic job discrimination in the segregated South E. provide evidence that educational progress was a precondition for economic progress in the segregated South