Final answer:
The Education for All Handicapped Children Act of 1975, originally Public Law 94-142, was renamed to the Individuals with Disabilities Education Act (IDEA) in 1990.
Step-by-step explanation:
The legislation that was retitled the Individuals with Disabilities Education Act (IDEA) is Public Law 94-142, previously known as the Education for All Handicapped Children Act of 1975. This act ensures that children with disabilities receive a free appropriate public education and promotes their rights and the involvement of their parents in their education. It was reauthorized in 1990 under the new title of IDEA, enhancing provisions for individual education plans, parent input, and the educational inclusion of children with disabilities.