What does the second "it" in "It cheapens it"(Line 7, Para.3) represent

A．Corporations attempt to cash in on the crisis in education.
B．Communications broadcasts into almost 12,000 junior high and high schools.
C．Education no longer becomes a learning process.
D．This article illustrates free markets and free minds are mutually exclusive.

A．Students are free to select TV programs.
B．Students are supposed to involve in national and community responsibility.
C．Students are free with their brand choice.
D．Students are free in selecting schools.