Answer:
so that they could better understand the diagnosis of ASD and for people who have it...
Honestly I would choose A.
A "subject complement" is a word or a group of words that appears in the PREDICATE part of the sentence BUT refers to or describes the SUBJECT. "B" is the correct answer, because "better" describes the subject "I," even though it appears AFTER the verb "felt," which means it is in the predicate part of the sentence. Hope this helps!!
Proper Nouns: Principal Billsley
Improper nouns: letter,company, roller coaster, school’s backyard, opportunity
I HOPE THIS HELPED