The author is most probably a(n)_________.

A．Title IX prohibits single-sex schooling.
B．Single-sex public schooling may threaten equality in education.
C．Single-sex schooling has both advantages and disadvantages.
D．Civil rights have long been under protection.

A．it was thought to be a discrimination against minority children
B．it failed to measure children's intellectual level precisely
C．schools arc forbidden to do it
D．it became useless