According to the Textbook,why Are Schools Unsuccessful in Overcoming Social

According to the textbook,why are schools unsuccessful in overcoming social class differences?

A) because there are differences in intelligence and ability between classes
B) because many non-middle-class students are marginalized by the gatekeepers in the system and so they come to resent and reject the system as irrelevant
C) because many extracurricular educational opportunities cost money and are available to people based on ability to pay
D) because people are more comfortable remaining with their own class