(2) Before the date of enactment of the Education for All Handicapped Children Act of 1975 (Public Law 94–142), the educational needs of millions of children with disabilities were not being fully met because—
(A) the children did not receive appropriate educational services;
(B) the children were excluded entirely from the public school system and from being educated with their peers;
(C) undiagnosed disabilities prevented the children from having a successful educational experience; or
(D) a lack of adequate resources within the public school system forced families to find services outside the public school system.