Which of the following statements is not true about ranking? ( )

A、Ranking performs a function which is neither professional nor educational, but merely economic.
B、The purpose of ranking is to identify and correct students’ faults or reinforcing their excellence.

C、It is when more people want something than the available supply can satisfy that ranking becomes necessary.
D、It is the limited admission to the small number of highly desired colleges that demands a ranking of the secondary school graduates.