You can advocate for any of them, but if you are guided by the most needy and probably least favored, you will advocate for the elementary student with special needs.
People with disabilities and special needs often have their rights reneged by difficulties in physical access to spaces or by contempt and neglect of society and government. In this way, you will be doing a repair while advocating for that person. After all, it will be a good attitude that will do you a personal good.